[Tutor] HELP: Creating animation from multiple plots
Dear All, I am a newbie to Python but have a fair know how of other languages i.e C etc. I want to run an astrophysical simulation in Python. All I have to do it to generate a set of 'plots' depending on a varying parameter and then stitch them up. 1) Is it possible to automatically generate different data files( say in the orders of 1000) with different names depending on a parameter? 2) Is it possible to plot the data sets right from Python itself and save the plots in different jpeg files to stitched upon later on. Awaiting your reply. Thank you in advance. Sincerely, Sayan -- -- *Sayan Chatterjee* Dept. of Physics and Meteorology IIT Kharagpur Lal Bahadur Shastry Hall of Residence Room AB 205 Mob: +91 9874513565 blog: www.blissprofound.blogspot.com Volunteer , Padakshep www.padakshep.org ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] HELP: Creating animation from multiple plots
Hi Sayan, On Wed, Mar 27, 2013 at 4:14 PM, Sayan Chatterjee sayanchatter...@gmail.com wrote: Dear All, I am a newbie to Python but have a fair know how of other languages i.e C etc. I want to run an astrophysical simulation in Python. All I have to do it to generate a set of 'plots' depending on a varying parameter and then stitch them up. 1) Is it possible to automatically generate different data files( say in the orders of 1000) with different names depending on a parameter? It certainly is. Are you talking about the file names being file_1001.txt, file_1002.txt and so on? If yes, let's say your parameter values are stored in param. Then something like this would do the trick: param_values = [1000,1001, 1005, 2001] for param in param_values: fname = 'file_' + str(param) # write to file fname # # Sorry if its different from what you are looking for. But yes, its certainly possible. 2) Is it possible to plot the data sets right from Python itself and save the plots in different jpeg files to stitched upon later on. It is possible to generate plots and save each as JPEGs. [1]. What do you mean by stitching together? [1] http://stackoverflow.com/questions/8827016/matplotlib-savefig-in-jpeg-format Best, Amit -- http://amitsaha.github.com/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] HELP: Creating animation from multiple plots
On Wed, Mar 27, 2013 at 4:23 PM, Amit Saha amitsaha...@gmail.com wrote: Hi Sayan, On Wed, Mar 27, 2013 at 4:14 PM, Sayan Chatterjee sayanchatter...@gmail.com wrote: Dear All, I am a newbie to Python but have a fair know how of other languages i.e C etc. I want to run an astrophysical simulation in Python. All I have to do it to generate a set of 'plots' depending on a varying parameter and then stitch them up. 1) Is it possible to automatically generate different data files( say in the orders of 1000) with different names depending on a parameter? It certainly is. Are you talking about the file names being file_1001.txt, file_1002.txt and so on? If yes, let's say your parameter values are stored in param. Then something like this would do the trick: param_values = [1000,1001, 1005, 2001] for param in param_values: fname = 'file_' + str(param) # write to file fname # # Sorry if its different from what you are looking for. But yes, its certainly possible. 2) Is it possible to plot the data sets right from Python itself and save the plots in different jpeg files to stitched upon later on. It is possible to generate plots and save each as JPEGs. [1]. What do you mean by stitching together? You probably meant creating an animation from them. Yes, it is certainly possible. I will try to find a link which makes it really easy to create an animation out of a bunch of images. Which operating system are you on? -Amit. -- http://amitsaha.github.com/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] HELP: Creating animation from multiple plots
Thanks a lot for your prompt reply. 1. Yes. This is exactly what I wanted. Creating a bunch of data sets and then writing script to plot them using gnuplot, but if something can produce directly 'plots' it will certainly be helpful. 2. Yes. By stitching them up I meant an animation.Sorry for the ambiguity. Exactly how we can do it Octave. Pls see this link: http://www.krizka.net/2009/11/06/creating-animations-with-octave/ I think Python is THE language, which may come to an immediate rescue. My OS is Linux Mint (Gnome 3) Sayan On 27 March 2013 11:57, Amit Saha amitsaha...@gmail.com wrote: On Wed, Mar 27, 2013 at 4:23 PM, Amit Saha amitsaha...@gmail.com wrote: Hi Sayan, On Wed, Mar 27, 2013 at 4:14 PM, Sayan Chatterjee sayanchatter...@gmail.com wrote: Dear All, I am a newbie to Python but have a fair know how of other languages i.e C etc. I want to run an astrophysical simulation in Python. All I have to do it to generate a set of 'plots' depending on a varying parameter and then stitch them up. 1) Is it possible to automatically generate different data files( say in the orders of 1000) with different names depending on a parameter? It certainly is. Are you talking about the file names being file_1001.txt, file_1002.txt and so on? If yes, let's say your parameter values are stored in param. Then something like this would do the trick: param_values = [1000,1001, 1005, 2001] for param in param_values: fname = 'file_' + str(param) # write to file fname # # Sorry if its different from what you are looking for. But yes, its certainly possible. 2) Is it possible to plot the data sets right from Python itself and save the plots in different jpeg files to stitched upon later on. It is possible to generate plots and save each as JPEGs. [1]. What do you mean by stitching together? You probably meant creating an animation from them. Yes, it is certainly possible. I will try to find a link which makes it really easy to create an animation out of a bunch of images. Which operating system are you on? -Amit. -- http://amitsaha.github.com/ -- -- *Sayan Chatterjee* Dept. of Physics and Meteorology IIT Kharagpur Lal Bahadur Shastry Hall of Residence Room AB 205 Mob: +91 9874513565 blog: www.blissprofound.blogspot.com Volunteer , Padakshep www.padakshep.org ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] HELP: Creating animation from multiple plots
On Wed, Mar 27, 2013 at 4:36 PM, Sayan Chatterjee sayanchatter...@gmail.com wrote: Thanks a lot for your prompt reply. 1. Yes. This is exactly what I wanted. Creating a bunch of data sets and then writing script to plot them using gnuplot, but if something can produce directly 'plots' it will certainly be helpful. Yes, indeed it is possible. You may want to explore matplotlib a bit. You can start with this tutorial [1]. [1] http://www.loria.fr/~rougier/teaching/matplotlib/ 2. Yes. By stitching them up I meant an animation.Sorry for the ambiguity. Exactly how we can do it Octave. Pls see this link: http://www.krizka.net/2009/11/06/creating-animations-with-octave/ Right, yes, if you see it uses mencoder/ffmpeg to create the animation. So, if you save your individual plots and then use one of these tools, you should be able to get the animation done. Matplotlib itself seems to have some Animated plotting capabilities, but I haven't had any experience with them. Best, Amit. -- http://amitsaha.github.com/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] HELP: Creating animation from multiple plots
Yes, ffmpeg will do if multiple plots can be generated using mathplotlib . I'll look up the links you provided and get back to you, if I can't figure it out. :) On 27 March 2013 12:12, Amit Saha amitsaha...@gmail.com wrote: On Wed, Mar 27, 2013 at 4:36 PM, Sayan Chatterjee sayanchatter...@gmail.com wrote: Thanks a lot for your prompt reply. 1. Yes. This is exactly what I wanted. Creating a bunch of data sets and then writing script to plot them using gnuplot, but if something can produce directly 'plots' it will certainly be helpful. Yes, indeed it is possible. You may want to explore matplotlib a bit. You can start with this tutorial [1]. [1] http://www.loria.fr/~rougier/teaching/matplotlib/ 2. Yes. By stitching them up I meant an animation.Sorry for the ambiguity. Exactly how we can do it Octave. Pls see this link: http://www.krizka.net/2009/11/06/creating-animations-with-octave/ Right, yes, if you see it uses mencoder/ffmpeg to create the animation. So, if you save your individual plots and then use one of these tools, you should be able to get the animation done. Matplotlib itself seems to have some Animated plotting capabilities, but I haven't had any experience with them. Best, Amit. -- http://amitsaha.github.com/ -- -- *Sayan Chatterjee* Dept. of Physics and Meteorology IIT Kharagpur Lal Bahadur Shastry Hall of Residence Room AB 205 Mob: +91 9874513565 blog: www.blissprofound.blogspot.com Volunteer , Padakshep www.padakshep.org ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Building Python 2.7.3 on RHEL 5.8 x86_64 -- Syntax Error
But, where did you get the idea that you could build Python RPMs using $python setup.py bdist_rpm ? I thought that was only limited to building RPMs for python packages (including extensions), but not the Python interpreter itself. Please correct me if i am wrong. Ok, so it's only for module distributions? I assumed it could package Python itself as well, because it creates a *.spec file that reads like this: %define name Python %define version 2.7.3 %define unmangled_version 2.7.3 %define release 1 Summary: A high-level object-oriented programming language Okay, here is something for you to try in the meantime. Download the Python 2.7 SRPM (source RPM) from http://koji.fedoraproject.org/koji/packageinfo?packageID=130. May be the F17 version. Extract it to get the source files, patches and the SPEC file. Thank you, I will try this today. In the meantime I have started a thread on the distutils mailing list, so as not to spam Tutor with my build woes. regards, Sean ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] IndexError: index out of bounds
Dear all, When trying to print or assign array elements, getting the following error: Traceback (most recent call last): File ZA.py, line 32, in module p_za[i] = p_initial[i] + t*K*cos(K*p_initial[i]); IndexError: index out of bounds I am using Numpy, is it due to that? I am attaching the code herewith. -- -- *Sayan Chatterjee* Dept. of Physics and Meteorology IIT Kharagpur Lal Bahadur Shastry Hall of Residence Room AB 205 Mob: +91 9874513565 blog: www.blissprofound.blogspot.com Volunteer , Padakshep www.padakshep.org ZA.py Description: Binary data ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] HELP: Creating animation from multiple plots
Hi Amit,
fo = fopen('fname','r+')
fo.write(%d %d,j,counter)
Is giving the following error:
File ZA.py, line 30, in module
fo = open('fname','r+')
IOError: [Errno 2] No such file or directory: 'fname'
Where is the mistake?
Cheers,
Sayan
On 27 March 2013 12:20, Amit Saha amitsaha...@gmail.com wrote:
On Wed, Mar 27, 2013 at 4:49 PM, Sayan Chatterjee
sayanchatter...@gmail.com wrote:
Yes, ffmpeg will do if multiple plots can be generated using mathplotlib
.
I'll look up the links you provided and get back to you, if I can't
figure
it out. :)
Sure, good luck! :)
On 27 March 2013 12:12, Amit Saha amitsaha...@gmail.com wrote:
On Wed, Mar 27, 2013 at 4:36 PM, Sayan Chatterjee
sayanchatter...@gmail.com wrote:
Thanks a lot for your prompt reply.
1. Yes. This is exactly what I wanted. Creating a bunch of data sets
and
then writing script to plot them using gnuplot, but if something can
produce
directly 'plots' it will certainly be helpful.
Yes, indeed it is possible. You may want to explore matplotlib a bit.
You can start with this tutorial [1].
[1] http://www.loria.fr/~rougier/teaching/matplotlib/
2. Yes. By stitching them up I meant an animation.Sorry for the
ambiguity.
Exactly how we can do it Octave.
Pls see this link:
http://www.krizka.net/2009/11/06/creating-animations-with-octave/
Right, yes, if you see it uses mencoder/ffmpeg to create the
animation. So, if you save your individual plots and then use one of
these tools, you should be able to get the animation done.
Matplotlib itself seems to have some Animated plotting capabilities,
but I haven't had any experience with them.
Best,
Amit.
--
http://amitsaha.github.com/
--
--
Sayan Chatterjee
Dept. of Physics and Meteorology
IIT Kharagpur
Lal Bahadur Shastry Hall of Residence
Room AB 205
Mob: +91 9874513565
blog: www.blissprofound.blogspot.com
Volunteer , Padakshep
www.padakshep.org
--
http://amitsaha.github.com/
--
--
*Sayan Chatterjee*
Dept. of Physics and Meteorology
IIT Kharagpur
Lal Bahadur Shastry Hall of Residence
Room AB 205
Mob: +91 9874513565
blog: www.blissprofound.blogspot.com
Volunteer , Padakshep
www.padakshep.org
___
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Re: [Tutor] HELP: Creating animation from multiple plots
On Wed, Mar 27, 2013 at 11:59 AM, Sayan Chatterjee
sayanchatter...@gmail.com wrote:
Hi Amit,
fo = fopen('fname','r+')
fo.write(%d %d,j,counter)
Is giving the following error:
File ZA.py, line 30, in module
fo = open('fname','r+')
IOError: [Errno 2] No such file or directory: 'fname'
Where is the mistake?
Where is the file called 'fname'? It must exist and be in the current
directory
Cheers,
Sayan
On 27 March 2013 12:20, Amit Saha amitsaha...@gmail.com wrote:
On Wed, Mar 27, 2013 at 4:49 PM, Sayan Chatterjee
sayanchatter...@gmail.com wrote:
Yes, ffmpeg will do if multiple plots can be generated using
mathplotlib .
I'll look up the links you provided and get back to you, if I can't
figure
it out. :)
Sure, good luck! :)
On 27 March 2013 12:12, Amit Saha amitsaha...@gmail.com wrote:
On Wed, Mar 27, 2013 at 4:36 PM, Sayan Chatterjee
sayanchatter...@gmail.com wrote:
Thanks a lot for your prompt reply.
1. Yes. This is exactly what I wanted. Creating a bunch of data sets
and
then writing script to plot them using gnuplot, but if something can
produce
directly 'plots' it will certainly be helpful.
Yes, indeed it is possible. You may want to explore matplotlib a bit.
You can start with this tutorial [1].
[1] http://www.loria.fr/~rougier/teaching/matplotlib/
2. Yes. By stitching them up I meant an animation.Sorry for the
ambiguity.
Exactly how we can do it Octave.
Pls see this link:
http://www.krizka.net/2009/11/06/creating-animations-with-octave/
Right, yes, if you see it uses mencoder/ffmpeg to create the
animation. So, if you save your individual plots and then use one of
these tools, you should be able to get the animation done.
Matplotlib itself seems to have some Animated plotting capabilities,
but I haven't had any experience with them.
Best,
Amit.
--
http://amitsaha.github.com/
--
--
Sayan Chatterjee
Dept. of Physics and Meteorology
IIT Kharagpur
Lal Bahadur Shastry Hall of Residence
Room AB 205
Mob: +91 9874513565
blog: www.blissprofound.blogspot.com
Volunteer , Padakshep
www.padakshep.org
--
http://amitsaha.github.com/
--
--
*Sayan Chatterjee*
Dept. of Physics and Meteorology
IIT Kharagpur
Lal Bahadur Shastry Hall of Residence
Room AB 205
Mob: +91 9874513565
blog: www.blissprofound.blogspot.com
Volunteer , Padakshep
www.padakshep.org
___
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--
Joel Goldstick
http://joelgoldstick.com
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Re: [Tutor] HELP: Creating animation from multiple plots
Hello,
On 27 March 2013 15:59, Sayan Chatterjee sayanchatter...@gmail.com wrote:
Hi Amit,
fo = fopen('fname','r+')
fo.write(%d %d,j,counter)
Is giving the following error:
File ZA.py, line 30, in module
fo = open('fname','r+')
IOError: [Errno 2] No such file or directory: 'fname'
Where is the mistake?
You are trying to open a file named literally fname due to putting it in
quotes, you probably want to drop the quotes.
Walter
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Re: [Tutor] IndexError: index out of bounds
On Wed, Mar 27, 2013 at 11:50 AM, Sayan Chatterjee sayanchatter...@gmail.com wrote: Dear all, When trying to print or assign array elements, getting the following error: Traceback (most recent call last): File ZA.py, line 32, in module p_za[i] = p_initial[i] + t*K*cos(K*p_initial[i]); You declare p_za = [] above. So there is no p_za[i]. You should use append since you are adding elements to the end of the list. IndexError: index out of bounds I am using Numpy, is it due to that? I am attaching the code herewith. -- -- *Sayan Chatterjee* Dept. of Physics and Meteorology IIT Kharagpur Lal Bahadur Shastry Hall of Residence Room AB 205 Mob: +91 9874513565 blog: www.blissprofound.blogspot.com Volunteer , Padakshep www.padakshep.org ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor -- Joel Goldstick http://joelgoldstick.com ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] IndexError: index out of bounds
Hi, On 27 March 2013 15:50, Sayan Chatterjee sayanchatter...@gmail.com wrote: Dear all, When trying to print or assign array elements, getting the following error: Traceback (most recent call last): File ZA.py, line 32, in module p_za[i] = p_initial[i] + t*K*cos(K*p_initial[i]); IndexError: index out of bounds I am using Numpy, is it due to that? I am attaching the code herewith. Not Numpy no. The p_za list appears to be empty at the point where the above assgnment to p_za[i] is done, hence you get the IndexError message. You should initialise p_za to be as long as needed first. Maybe by simply using p_za = [None] * N instead of assigning [], or alternately perhaps by appending instead at the point where you first reference p_ze[i]. Walter ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] HELP: Creating animation from multiple plots
for t in range(0,200):
fname = 'file_' + str(t)
So it will assign fname values file_0, file_1 so on. Dropping the quotes is
giving me
IOError: [Errno 2] No such file or directory: 'file_0'
Indeed the file is not present. In C we write,if we have to record data in
a file
FILE *fp
fp = fopen(file.dat,w)
Here I want to write different data sets in files having different name i.e
I want to create the files with the data sets. I am quite new to Python, so
you can assume zero knowledge while answering. Thanks for your support. :)
On 27 March 2013 21:38, Walter Prins wpr...@gmail.com wrote:
Hello,
On 27 March 2013 15:59, Sayan Chatterjee sayanchatter...@gmail.comwrote:
Hi Amit,
fo = fopen('fname','r+')
fo.write(%d %d,j,counter)
Is giving the following error:
File ZA.py, line 30, in module
fo = open('fname','r+')
IOError: [Errno 2] No such file or directory: 'fname'
Where is the mistake?
You are trying to open a file named literally fname due to putting it in
quotes, you probably want to drop the quotes.
Walter
--
--
*Sayan Chatterjee*
Dept. of Physics and Meteorology
IIT Kharagpur
Lal Bahadur Shastry Hall of Residence
Room AB 205
Mob: +91 9874513565
blog: www.blissprofound.blogspot.com
Volunteer , Padakshep
www.padakshep.org
___
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Re: [Tutor] HELP: Creating animation from multiple plots
Putting w instead of r+ probably solves the problem. The error is not
showing now.
On 27 March 2013 21:47, Sayan Chatterjee sayanchatter...@gmail.com wrote:
for t in range(0,200):
fname = 'file_' + str(t)
So it will assign fname values file_0, file_1 so on. Dropping the quotes
is giving me
IOError: [Errno 2] No such file or directory: 'file_0'
Indeed the file is not present. In C we write,if we have to record data in
a file
FILE *fp
fp = fopen(file.dat,w)
Here I want to write different data sets in files having different name
i.e I want to create the files with the data sets. I am quite new to
Python, so you can assume zero knowledge while answering. Thanks for your
support. :)
On 27 March 2013 21:38, Walter Prins wpr...@gmail.com wrote:
Hello,
On 27 March 2013 15:59, Sayan Chatterjee sayanchatter...@gmail.comwrote:
Hi Amit,
fo = fopen('fname','r+')
fo.write(%d %d,j,counter)
Is giving the following error:
File ZA.py, line 30, in module
fo = open('fname','r+')
IOError: [Errno 2] No such file or directory: 'fname'
Where is the mistake?
You are trying to open a file named literally fname due to putting it
in quotes, you probably want to drop the quotes.
Walter
--
--
*Sayan Chatterjee*
Dept. of Physics and Meteorology
IIT Kharagpur
Lal Bahadur Shastry Hall of Residence
Room AB 205
Mob: +91 9874513565
blog: www.blissprofound.blogspot.com
Volunteer , Padakshep
www.padakshep.org
--
--
*Sayan Chatterjee*
Dept. of Physics and Meteorology
IIT Kharagpur
Lal Bahadur Shastry Hall of Residence
Room AB 205
Mob: +91 9874513565
blog: www.blissprofound.blogspot.com
Volunteer , Padakshep
www.padakshep.org
___
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Re: [Tutor] HELP: Creating animation from multiple plots
You were opening the file for reading, rather than writing. It
therefore was expecting to find a file.
Change
fo = open('fname','r+')
to
fo = open('fname','w')
Bodsda
On 27 March 2013 16:17, Sayan Chatterjee sayanchatter...@gmail.com wrote:
for t in range(0,200):
fname = 'file_' + str(t)
So it will assign fname values file_0, file_1 so on. Dropping the quotes is
giving me
IOError: [Errno 2] No such file or directory: 'file_0'
Indeed the file is not present. In C we write,if we have to record data in a
file
FILE *fp
fp = fopen(file.dat,w)
Here I want to write different data sets in files having different name i.e
I want to create the files with the data sets. I am quite new to Python, so
you can assume zero knowledge while answering. Thanks for your support. :)
On 27 March 2013 21:38, Walter Prins wpr...@gmail.com wrote:
Hello,
On 27 March 2013 15:59, Sayan Chatterjee sayanchatter...@gmail.com
wrote:
Hi Amit,
fo = fopen('fname','r+')
fo.write(%d %d,j,counter)
Is giving the following error:
File ZA.py, line 30, in module
fo = open('fname','r+')
IOError: [Errno 2] No such file or directory: 'fname'
Where is the mistake?
You are trying to open a file named literally fname due to putting it in
quotes, you probably want to drop the quotes.
Walter
--
--
Sayan Chatterjee
Dept. of Physics and Meteorology
IIT Kharagpur
Lal Bahadur Shastry Hall of Residence
Room AB 205
Mob: +91 9874513565
blog: www.blissprofound.blogspot.com
Volunteer , Padakshep
www.padakshep.org
___
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
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Re: [Tutor] IndexError: index out of bounds
p_za = [None]*N is not giving away the error message. for i in range(0,N): p_za.append = p_initial[i] + t*K*cos(K*p_initial[i]); is also not working. Could you please redirect me to a link where the example is demonstrated? What is the simplest way to assign an array element a value? i.e the C analogue of: int array[200] for(i=0;i200;i++) array[i] = 2*i + 5; On 27 March 2013 21:44, Walter Prins wpr...@gmail.com wrote: Hi, On 27 March 2013 15:50, Sayan Chatterjee sayanchatter...@gmail.comwrote: Dear all, When trying to print or assign array elements, getting the following error: Traceback (most recent call last): File ZA.py, line 32, in module p_za[i] = p_initial[i] + t*K*cos(K*p_initial[i]); IndexError: index out of bounds I am using Numpy, is it due to that? I am attaching the code herewith. Not Numpy no. The p_za list appears to be empty at the point where the above assgnment to p_za[i] is done, hence you get the IndexError message. You should initialise p_za to be as long as needed first. Maybe by simply using p_za = [None] * N instead of assigning [], or alternately perhaps by appending instead at the point where you first reference p_ze[i]. Walter ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor -- -- *Sayan Chatterjee* Dept. of Physics and Meteorology IIT Kharagpur Lal Bahadur Shastry Hall of Residence Room AB 205 Mob: +91 9874513565 blog: www.blissprofound.blogspot.com Volunteer , Padakshep www.padakshep.org ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] HELP: Creating animation from multiple plots
Oh yes, thanks. That worked. :)
On 27 March 2013 21:58, Bod Soutar bod...@googlemail.com wrote:
You were opening the file for reading, rather than writing. It
therefore was expecting to find a file.
Change
fo = open('fname','r+')
to
fo = open('fname','w')
Bodsda
On 27 March 2013 16:17, Sayan Chatterjee sayanchatter...@gmail.com
wrote:
for t in range(0,200):
fname = 'file_' + str(t)
So it will assign fname values file_0, file_1 so on. Dropping the quotes
is
giving me
IOError: [Errno 2] No such file or directory: 'file_0'
Indeed the file is not present. In C we write,if we have to record data
in a
file
FILE *fp
fp = fopen(file.dat,w)
Here I want to write different data sets in files having different name
i.e
I want to create the files with the data sets. I am quite new to Python,
so
you can assume zero knowledge while answering. Thanks for your support.
:)
On 27 March 2013 21:38, Walter Prins wpr...@gmail.com wrote:
Hello,
On 27 March 2013 15:59, Sayan Chatterjee sayanchatter...@gmail.com
wrote:
Hi Amit,
fo = fopen('fname','r+')
fo.write(%d %d,j,counter)
Is giving the following error:
File ZA.py, line 30, in module
fo = open('fname','r+')
IOError: [Errno 2] No such file or directory: 'fname'
Where is the mistake?
You are trying to open a file named literally fname due to putting it
in
quotes, you probably want to drop the quotes.
Walter
--
--
Sayan Chatterjee
Dept. of Physics and Meteorology
IIT Kharagpur
Lal Bahadur Shastry Hall of Residence
Room AB 205
Mob: +91 9874513565
blog: www.blissprofound.blogspot.com
Volunteer , Padakshep
www.padakshep.org
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--
--
*Sayan Chatterjee*
Dept. of Physics and Meteorology
IIT Kharagpur
Lal Bahadur Shastry Hall of Residence
Room AB 205
Mob: +91 9874513565
blog: www.blissprofound.blogspot.com
Volunteer , Padakshep
www.padakshep.org
___
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Re: [Tutor] HELP: Creating animation from multiple plots
Sayan Chatterjee wrote:
for t in range(0,200):
fname = 'file_' + str(t)
So it will assign fname values file_0, file_1 so on. Dropping the quotes
is giving me
IOError: [Errno 2] No such file or directory: 'file_0'
Indeed the file is not present. In C we write,if we have to record data in
a file
FILE *fp
fp = fopen(file.dat,w)
Here I want to write different data sets in files having different name
i.e I want to create the files with the data sets. I am quite new to
Python, so you can assume zero knowledge while answering. Thanks for your
support. :)
If you try to open a non-existent file in r+ mode in C you should get an
error, too. The following C code
FILE * f;
int i;
char filename[100];
for (i=0; i10; i++) {
sprintf(filename, foo%d.dat, i);
FILE * f = fopen(filename, w);
/* write stuff to file */
...
fclose(f);
}
translates into this piece of Python:
for i in range(10):
filename = foo%d.dat % i
with open(filename, w) as f:
# write stuff to file
...
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Re: [Tutor] IndexError: index out of bounds
Hi Sayan, On 27 March 2013 16:31, Sayan Chatterjee sayanchatter...@gmail.com wrote: p_za = [None]*N is not giving away the error message. for i in range(0,N): p_za.append = p_initial[i] + t*K*cos(K*p_initial[i]); is also not working. append() is a method, so using append you want something like: for i in range(0,N): p_za.append( p_initial[i] + t*K*cos(K*p_initial[i]) ); After every loop iteration, the list grows by having one item appended to it, being the result of the expression: p_initial[i] + t*K*cos(K*p_initial[i]) Could you please redirect me to a link where the example is demonstrated? http://courses.cms.caltech.edu/cs11/material/python/misc/python_idioms.html See the paragraph on Sequence multiplication. What is the simplest way to assign an array element a value? What you have is fine for assignment to a particular slot in the list. What you've missed and has already been pointed out, is to initialise/set the length of your list first, before trying to set the value of arbitrary slots. In the C example you posted the array is declared with length 200 up front. In your Python code however you assign [], which is a list of length 0. By contrast, the expression I gave you before, e.g. [None] * N, generates a list of length N, with each element in the list being the None object, thus initialising the list, ensuring that you can later assign to arbitrary slots when needed. Walter ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] IndexError: index out of bounds
Sayan Chatterjee wrote: When trying to print or assign array elements, getting the following error: Traceback (most recent call last): File ZA.py, line 32, in module p_za[i] = p_initial[i] + t*K*cos(K*p_initial[i]); IndexError: index out of bounds I am using Numpy, is it due to that? I am attaching the code herewith. If you are using numpy it is likely that you don't need to loop over the index explicitly. Assuming t and K are scalars, and p_initial is a numpy array you can write p_za = p_initial + t * K * numpy.cos(K*p_initial) For example: import numpy p_initial = numpy.array([1.2, 3.4, 5.6]) t = 1.1 K = 2.2 p_initial + t*K*numpy.cos(K*p_initial) array([-0.92189929, 4.28408588, 7.94692559]) Quite powerful, once you get the knack of it. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] IndexError: index out of bounds
Hi Walter, Thanks a lot! Yes, now I get your point. append is working perfectly fine. Hi Peter: Exactly. It's very nice. Indices needn't have to be mentioned explicitly. No explicit looping and the thing is done! But I have a question, whenever we want to do operations on the individual array elements, don't we have to mention the indices explicitly i.e p_za[i]? 1) Traceback (most recent call last): File ZA.py, line 44, in module p_za = p_za % 4 TypeError: unsupported operand type(s) for %: 'list' and 'int' 2) Traceback (most recent call last): File ZA.py, line 43, in module if p_za[i] 4.0: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() When the i indices are removed * (1) * error message is showing up and when i is included *(2) *is shown.* * On 27 March 2013 22:29, Walter Prins wpr...@gmail.com wrote: Hi Sayan, On 27 March 2013 16:31, Sayan Chatterjee sayanchatter...@gmail.comwrote: p_za = [None]*N is not giving away the error message. for i in range(0,N): p_za.append = p_initial[i] + t*K*cos(K*p_initial[i]); is also not working. append() is a method, so using append you want something like: for i in range(0,N): p_za.append( p_initial[i] + t*K*cos(K*p_initial[i]) ); After every loop iteration, the list grows by having one item appended to it, being the result of the expression: p_initial[i] + t*K*cos(K*p_initial[i]) Could you please redirect me to a link where the example is demonstrated? http://courses.cms.caltech.edu/cs11/material/python/misc/python_idioms.html See the paragraph on Sequence multiplication. What is the simplest way to assign an array element a value? What you have is fine for assignment to a particular slot in the list. What you've missed and has already been pointed out, is to initialise/set the length of your list first, before trying to set the value of arbitrary slots. In the C example you posted the array is declared with length 200 up front. In your Python code however you assign [], which is a list of length 0. By contrast, the expression I gave you before, e.g. [None] * N, generates a list of length N, with each element in the list being the None object, thus initialising the list, ensuring that you can later assign to arbitrary slots when needed. Walter -- -- *Sayan Chatterjee* Dept. of Physics and Meteorology IIT Kharagpur Lal Bahadur Shastry Hall of Residence Room AB 205 Mob: +91 9874513565 blog: www.blissprofound.blogspot.com Volunteer , Padakshep www.padakshep.org ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] IndexError: index out of bounds
Sayan Chatterjee wrote: Hi Walter, Thanks a lot! Yes, now I get your point. append is working perfectly fine. Hi Peter: Exactly. It's very nice. Indices needn't have to be mentioned explicitly. No explicit looping and the thing is done! But I have a question, whenever we want to do operations on the individual array elements, don't we have to mention the indices explicitly i.e p_za[i]? For Python's built-in list, yes, but not for numpy arrays. 1) Traceback (most recent call last): File ZA.py, line 44, in module p_za = p_za % 4 TypeError: unsupported operand type(s) for %: 'list' and 'int' items = [3, 4, 5] items % 2 Traceback (most recent call last): File stdin, line 1, in module TypeError: unsupported operand type(s) for %: 'list' and 'int' items = numpy.array(items) items % 2 array([1, 0, 1]) Even for lists you can do better than using an explicit index, you can iterate over its members: items = [3, 4, 5] [v % 2 for v in items] [1, 0, 1] 2) Traceback (most recent call last): File ZA.py, line 43, in module if p_za[i] 4.0: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() When the i indices are removed * (1) * error message is showing up and when i is included *(2) *is shown.* * You are probably seeing that error because p_za[i] is a numpy.array, i. e. you have a list of arrays: items = [numpy.array([1,2]), numpy.array([3,4])] items[0] 4 array([False, False], dtype=bool) if items[0] 4: pass ... Traceback (most recent call last): File stdin, line 1, in module ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() How you managed to get there and what you actually want to achieve -- I can't tell from what you provide. Perhaps you can give a little more context, in code, but more importantly in prose. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] IndexError: index out of bounds
On 27/03/13 17:36, Sayan Chatterjee wrote: 2) Traceback (most recent call last): File ZA.py, line 43, in module if p_za[i] 4.0: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() This implies that p_za[i] is actually an array. So maybe p_za is a list (of arrays)? Try printing it to see. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] IndexError: index out of bounds
Hi Peter, Thanks!! Yes, when handled as a numpy array, it's working fine! Traceback (most recent call last): File ZA.py, line 59, in module if temp_za == j: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() This error occurs when the temp_za ( a numpy array, print temp_za works fine) is compared with j. I am attaching the code. Another question how do I get an integer value for p_za / 2 . Type casting with int says: TypeError: only length-1 arrays can be converted to Python scalars. On 27 March 2013 23:37, Alan Gauld alan.ga...@btinternet.com wrote: On 27/03/13 17:36, Sayan Chatterjee wrote: 2) Traceback (most recent call last): File ZA.py, line 43, in module if p_za[i] 4.0: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() This implies that p_za[i] is actually an array. So maybe p_za is a list (of arrays)? Try printing it to see. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ __**_ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/**mailman/listinfo/tutorhttp://mail.python.org/mailman/listinfo/tutor -- -- *Sayan Chatterjee* Dept. of Physics and Meteorology IIT Kharagpur Lal Bahadur Shastry Hall of Residence Room AB 205 Mob: +91 9874513565 blog: www.blissprofound.blogspot.com Volunteer , Padakshep www.padakshep.org ZA.py Description: Binary data ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Modules
Hi, I just started with Python and found a course named Python programming by Jody S. Gunther. My problem starts with the chapter Introduction to Modules. The first line in the program is: from tkinter import * and here I'm getting an error: ImportError: No module named tkinter What to do? ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Modules
I just started with Python and found a course named Python programming by Jody S. Gunther. My problem starts with the chapter Introduction to Modules. The first line in the program is: from tkinter import * and here I'm getting an error: ImportError: No module named tkinter Case matters. Tkinter should be capitalized. Best of wishes! ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Modules
On 27/03/2013 19:34, Cor Heisterkamp wrote: Hi, I just started with Python and found a course named Python programming by Jody S. Gunther. My problem starts with the chapter Introduction to Modules. The first line in the program is: from tkinter import * and here I'm getting an error: ImportError: No module named tkinter What to do? This works for me with Python 3.3 on Windows Vista. What OS and Python version are you using, as I believe that this was tKinter in Python 2? -- If you're using GoogleCrap™ please read this http://wiki.python.org/moin/GoogleGroupsPython. Mark Lawrence ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Modules
On Wed, Mar 27, 2013 at 4:12 PM, Mark Lawrence breamore...@yahoo.co.ukwrote: On 27/03/2013 19:34, Cor Heisterkamp wrote: Hi, I just started with Python and found a course named Python programming by Jody S. Gunther. My problem starts with the chapter Introduction to Modules. The first line in the program is: from tkinter import * and here I'm getting an error: ImportError: No module named tkinter What to do? google it and you find: http://wiki.python.org/moin/TkInter Step 2 - can Tkinter be imported? Try the correct command for your version at the Python prompt: import Tkinter # no underscore, uppercase 'T' for versions prior to V3.0 import tkinter # no underscore, lowercase 't' for V3.0 and later This works for me with Python 3.3 on Windows Vista. What OS and Python version are you using, as I believe that this was tKinter in Python 2? -- If you're using GoogleCrap™ please read this http://wiki.python.org/moin/* *GoogleGroupsPython http://wiki.python.org/moin/GoogleGroupsPython. Mark Lawrence __**_ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/**mailman/listinfo/tutorhttp://mail.python.org/mailman/listinfo/tutor -- Joel Goldstick http://joelgoldstick.com ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Modules
On 27/03/13 19:34, Cor Heisterkamp wrote: My problem starts with the chapter Introduction to Modules. The first line in the program is: from tkinter import * and here I'm getting an error: ImportError: No module named tkinter Thats an unfortunate exampole the author has chosen. Tkinter is an unusual module in that it requires support for Tcl/Tk to be compiled into the interpreter. This is not always the case. So there are 3 possible causes of the error: 1) Your python does not have support for Tcl/Tk built in. Which version of Python and which OS are you using? If your version does not support Tcl you need to either build a version from source or find a copy for your OS with Tkinter support. The default downloads for MacOS, Windows and most Linuxes have it but the OS installed versions often don't. 2) The tutor is aimed at Python v3 but you are using v2 Which version of Python are you running? What does it say when you start the Python interpreter prompt? 3) The tutor and you are both on V2 but you mistyped (or it has a typo) that says tkinter when it should say Tkinter. Try typing import Tkinter HTH -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] IndexError: index out of bounds
Sayan Chatterjee wrote: Yes, when handled as a numpy array, it's working fine! Traceback (most recent call last): File ZA.py, line 59, in module if temp_za == j: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() From the attached script: if temp_za == j: counter += 1 Do you want to count the entries? temp_za = numpy.array([1, 2, 3, 2, 1, 1]) (temp_za == 1).sum() 3 This error occurs when the temp_za ( a numpy array, print temp_za works fine) is compared with j. I am attaching the code. I'm sorry, I am lacking the domain knowledge to make sense of it. Just one more remark: [] 0.0 is always False, regardless of the contents of the list Another question how do I get an integer value for p_za / 2 . Type casting with int says: TypeError: only length-1 arrays can be converted to Python scalars. I'd use numpy.array(p_za//2, dtype=int) but I'm not a numpy expert. As you dig deeper the tutor mailing list may not be the best place to ask -- numpy has a dedicated mailing list of its own. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Building Python 2.7.3 on RHEL 5.8 x86_64 -- Syntax Error
On Wed, Mar 27, 2013 at 11:05 PM, Sean Carolan scaro...@gmail.com wrote: But, where did you get the idea that you could build Python RPMs using $python setup.py bdist_rpm ? I thought that was only limited to building RPMs for python packages (including extensions), but not the Python interpreter itself. Please correct me if i am wrong. Ok, so it's only for module distributions? I assumed it could package Python itself as well, because it creates a *.spec file that reads like this: %define name Python %define version 2.7.3 %define unmangled_version 2.7.3 %define release 1 Summary: A high-level object-oriented programming language Hmm. Let's see, it was a guess on my part as well. Okay, here is something for you to try in the meantime. Download the Python 2.7 SRPM (source RPM) from http://koji.fedoraproject.org/koji/packageinfo?packageID=130. May be the F17 version. Extract it to get the source files, patches and the SPEC file. Thank you, I will try this today. In the meantime I have started a thread on the distutils mailing list, so as not to spam Tutor with my build woes. I will follow the thread there and see what comes out of it. This is interesting! FWIW, I tried to get the SRPM and build Python 2.7 on RHEL 5. Quickly realized that it lacks, yum-builddep, yumdownloader, etc :-/ So, just left it there for then. I will have to try again the manual way. -Amit. -- http://amitsaha.github.com/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Modules
On Wed, Mar 27, 2013 at 5:09 PM, Alan Gauld alan.ga...@btinternet.com wrote: Tkinter is an unusual module in that it requires support for Tcl/Tk to be compiled into the interpreter. This is not always the case. The _tkinter module is a C extension that links to Tcl/Tk. On Debian Linux, _tkinter (_tkinter.so) is in the package python-tk / python3-tk. The ImportError raised by import tkinter suggests the required package. Except for Python 3.2 it incorrectly suggests the 2.x package: ImportError: No module named _tkinter, please install the python-tk package IIRC the official Python installer on Windows defaults to installing tkinter, but it is optional. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
