[sage-support] Re: Will Sage run on a 4GB Asus Eee PC?
Hi, i'm not using an eeepc, but i think your slax + sage + python +... would be really interesting for many ppl using this sort of software. Means, an official ISO image would be fantastic :D This distro is not only for EeePC, but it can run on other PC and Notebook. Only I had added some modules and option for EeePC. I had test it on a Dell server, Toshiba A100 NB and OK. Now, the iso image is made and put at the site: a href=http://diffusion.cgu.edu.tw/ftp;ModTeXmacs-1.0.6.14.iso/a about 1.3G, where ModTeXmacs - Modulization and TeXmacs. This DVD will be released and freely distributed in 5th European Coference of Math in Amsterdam, 2008/07/14~18. Thanks for contribution of every developers of open sources. cch --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] R interface issues
Hi, Maybe I am doing something wrong. I used to work with rpy and it worked fairly well. I am having trouble with the new R interface. For example, I can't explain why: r.summary(r.c(1,2,3,11,2,3,4,5)) works perfectly fine but: x = r.cbind(1, 1:7) gives me a syntax error and y = r.apply(x,2,median) tells me NameError: name 'median' is not defined All of these functions work well if I switch the entire notebook to evaluate cells using R. Where can I found documentation on the R interface, I specially need info for moving large arrays from sage to R and vice versa. (with rpy, one could use the array function or assign function and use No_Conversion to get R objects in memory) Thanks Shahab P.S. I am using Sage 3.0 running on OpenSuse 10.3 I also had to comment out the test for the R_HOME script in the R file located in the bin directories for Sage and local/lib/R in order to be able to install various R packages. --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: R interface issues
Hi Shahab, disclaimer: I have never used R. But hopefully my remarks make sense. On May 15, 9:49 am, shahab [EMAIL PROTECTED] wrote: x = r.cbind(1, 1:7) gives me a syntax error and It complains about the colon in 1:7. Do you mean 1/7 or 1.7? Both work: sage: x = r.cbind(1,1/7) sage: x sage6 sage5 [1,] 1 0.1428571 sage: x = r.cbind(1,1.7) sage: x sage3 sage2 [1,] 1 1.7 y = r.apply(x,2,median) tells me NameError: name 'median' is not defined I guess you forgot the quotation marks around median: sage: y=r.apply(x,2,'median') sage: y sage3 sage2 1.0 1.7 Cheers Simon --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: matrix over the booleans
great: that's exactly the case. the adjacency matrix of transitive
closure is the reachability matrix, so this is a good workarround.
On 14 Maio, 16:16, Jason Grout [EMAIL PROTECTED] wrote:
Jason Grout wrote:
William Stein wrote:
On Wed, May 14, 2008 at 6:57 AM, David Joyner [EMAIL PROTECTED] wrote:
On Wed, May 14, 2008 at 8:54 AM, Pedro Patricio [EMAIL PROTECTED] wrote:
nope, booleans means 1+1=1.
take + as OR and * as AND in the propositional calculus.
So 1+1 = 1 and 1*1 = 1 and 1*0 = 0 and 1+0 = 1 and 0+0=0?
That's *not* a ring, so you shouldn't make matrices over it in
Sage, since in Sage all matrices are over rings.
You could fake things by creating a new the booleans data
type but then you are asking for trouble since they aren't a ring.
You could also just make a very simple boolean type with
the properties you want and make a numpy matrix with
entries that type. What do you actually want to *do* with
your boolean matrix?
From your post on sage-edu, it sounds like you just want the adjacency
matrix of the transitive closure of a digraph; is that right? If so,
you might use the transitive closure function. I can't remember if it
is defined for digraphs, but it should be easy to extend.
Sorry, I wasn't thinking. Of course the transitive closure function is
defined for digraphs: that's the only case where it's actually interesting.
sage: g=DiGraph({0:[1,2], 1:[3], 2:[5,6]})
sage: g.transitive_closure().adjacency_matrix()
[0 1 1 1 1 1]
[0 0 0 1 0 0]
[0 0 0 0 1 1]
[0 0 0 0 0 0]
[0 0 0 0 0 0]
[0 0 0 0 0 0]
The transitive closure function isn't very smart right now. It ought to
be sped up by looking at the strongly connected components (I don't know
if we already have a function to do that, though).
Jason
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[sage-support] Re: Will Sage run on a 4GB Asus Eee PC?
On Thu, May 15, 2008 at 12:08 AM, chu-ching huang [EMAIL PROTECTED] wrote: Hi, i'm not using an eeepc, but i think your slax + sage + python +... would be really interesting for many ppl using this sort of software. Means, an official ISO image would be fantastic :D This distro is not only for EeePC, but it can run on other PC and Notebook. Only I had added some modules and option for EeePC. I had test it on a Dell server, Toshiba A100 NB and OK. Now, the iso image is made and put at the site: a href=http://diffusion.cgu.edu.tw/ftp;ModTeXmacs-1.0.6.14.iso/a about 1.3G, where ModTeXmacs - Modulization and TeXmacs. This DVD will be released and freely distributed in 5th European Coference of Math in Amsterdam, 2008/07/14~18. Thanks for contribution of every developers of open sources. Incidentally, I will be at the last two days of the above conference in Amsterdam. I'm giving a talk about number theory on the 18th. -- William --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Cannot create notebook.log: Permission denied...Broken pipe
Willaim, I'll give Sage another try when I get a new computer (which hopefully isn't too far off), or when there is a native Sage for windows. Thank you for your time. For now, I will stick to straight Python. I admire your dedication to the Sage project and wish you success. I will give Sage another look later on. (I might try out sympy in Python now.) Travis On May 14, 10:58 pm, William Stein [EMAIL PROTECTED] wrote: On Wed, May 14, 2008 at 8:49 PM, Travis [EMAIL PROTECTED] wrote: William, My machine- CPU: AMD Athalon XP 1800+ (1.53 GHz) OS: XP SP2 (I have kept the patches up to date) Mother board: A-K7T3 Ultra-2 MSI Memory: 1.00 GB RAM I did re-unzip sage-vmware-3.0.1.zip I think I know the general source of my problemsThe Firefox notebook does not work unless I am on the internet. Firefox could not find the notebook server (http://192.168.70.128) unless I was logged on to the internet. I did an experiment. I got Sage working while I was on the internet and everything worked fine. I logged off the internet and Sage stopped working. I logged back on and Sage still would not work. While I was still on the internet I closed the VM and restarted Sage. It still did not work. I imagine I would have to reboot in order to get Sage working again. I have a dial-up connection. (I downloaded Sage elsewhere!) Sage is not going to work for me if I must be online in order to use it. Admittedly, the problem may be due to my older machine. You undoubtedly tried to upgrade() the machine then somehow messed it up along the way. I did not try to upgrade() the VM. I just downloaded the VM and sage- vmware-3.0.1.zip the other day. Documentation suggestions: (1) If it is true that the computer must be on the internet in order for Sage and/or the VM to work it should be clearly noted in the documentation. One absolutely definitely does *not* need to be online in order to use Sage-vmware. There must be something messed up about your Microsoft Windows system configuration. The only thing I can think to suggest is playing with the networking setting of vmware player, and possibly looking at the vmware forums. If that doesn't work, it might be that you'll have to wait until we create a full native version of Sage for windows before using Sage. -- William Stein Associate Professor of Mathematics University of Washingtonhttp://wstein.org --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Cannot create notebook.log: Permission denied...Broken pipe
Wolfgang, Thank you for your suggestion. I gave it a try and unfortunately it did not work in my case. Take care, Travis On May 15, 2:25 am, [EMAIL PROTECTED] wrote: 2008/5/15 Travis [EMAIL PROTECTED]: William, My machine- CPU: AMD Athalon XP 1800+ (1.53 GHz) OS: XP SP2 (I have kept the patches up to date) Mother board: A-K7T3 Ultra-2 MSI Memory: 1.00 GB RAM I did re-unzip sage-vmware-3.0.1.zip I think I know the general source of my problemsThe Firefox notebook does not work unless I am on the internet. Firefox could not find the notebook server (http://192.168.70.128) unless I was logged on to the internet. I did an experiment. I got Sage working while I was on the internet and everything worked fine. I logged off the internet and Sage stopped working. I logged back on and Sage still would not work. While I was still on the internet I closed the VM and restarted Sage. It still did not work. I imagine I would have to reboot in order to get Sage working again. I have a dial-up connection. (I downloaded Sage elsewhere!) Sage is not going to work for me if I must be online in order to use it. Admittedly, the problem may be due to my older machine. You undoubtedly tried to upgrade() the machine then somehow messed it up along the way. I did not try to upgrade() the VM. I just downloaded the VM and sage- vmware-3.0.1.zip the other day. Documentation suggestions: (1) If it is true that the computer must be on the internet in order for Sage and/or the VM to work it should be clearly noted in the documentation. (2) Even if Sage/Firefox notebook generally does not require the internet, the documentation for those Sage functions that do should indicate as much. Case in point:http://sagemath.org/SAGEbin/microsoft_windows/README.txt, USING SAGE, bullet 3. The optional_packages() function obviously will not work unless there is an internet connection, as the list of optional_packages() is on your website. There is no indication in bullet 3 that an internet connection is required. Travis Hi, (I am very new to Sage and I presently have no access to the system I am referring to; so please ignore if this advice does not make sense.) I exeprienced a similar problem. The reason was (I believe) that when disconnecting from the Internet my browser is set automatically into offline mode. Putting the browser back into online mode (without connecting to the Internet) solved my problem. Wolfgang On May 14, 10:01 am, William Stein [EMAIL PROTECTED] wrote: On Wed, May 14, 2008 at 7:36 AM, Travis [EMAIL PROTECTED] wrote: William, I'm impressed that you take the time to answer all these emails. Well I eventually did get the notebook and command line Sage to work for a while. I managed to crash sage a few times with commands from the Tutorial such as the linear algebra command kernel() and the matplotlib command 'show()'. I believe it was sage that crashed because calculations were no longer carried out in the notebook. When I crashed it from the Vmware command line I was not able to recover. Restarting Sage does not help because Vmware takes me to its last state, which is a dollar sign prompt. when I type 'notebook' at the prompt I get the standard message followed by, sh: cannot create notebook.log: Permission denied echo: write error: Broken pipe If I type 'sage' at the $ prompt I get about 20 or 30 lines of text (which I can't copy and paste) followed by the prompt, ERROR: name 'sage_prompt' is not defined You undoubtedly tried to upgrade() the machine then somehow messed it up along the way. Is there a way to reset the Vmware state? You could unzip the original sage-vmware.zip file that you downloaded. Or download a new version of sage. Why are certain commands found in the Tutorial such as kernel() and show() causing Sage to crash? It's possible that your computer has a processor that is very old, and the binary build of Sage included in the vmware image doesn't support your computer. I'm working on getting a very old computer setup to build vmware images that will work on an even wider class of machines... What is the exact model of your machine. Unless there is a quick fix I may just have to wait until I have a Linux system or partition before trying Sage, because this Vmware approach is not working well for me and is taking too much time. You could download a new vmware image from here if you have a fast net connection: http://sagemath.org/SAGEbin/microsoft_windows/ The sage-vmware-3.0.1.b.zip version has a full latex install included, which is a nice bonus. Also, I've explicitly disabled the upgrade() function, so you won't use upgrade by accident. Travis On May 13, 11:12 am, William Stein [EMAIL PROTECTED] wrote: On Tue, May 13, 2008 at 9:31 AM, Travis [EMAIL PROTECTED] wrote:
[sage-support] Sage Notebook Transfer
I copied sage 3.0 binary to a different location (which worked fine). I also moved the directory sage_notebook to a different location. When I start the notebook pointed to this new directory, it starts fine but all the users info are gone. All the worksheets are still there. If I add a user to the account (same username as before), none of the worksheets show up. Creating a new worksheet just adds a worksheet to the preexisting directory for that user. How can I get access to the old worksheets? Thanks in advance, Shahab --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Sage Notebook Transfer
Are you certain that you are getting the new path correct? I've thought that this happened to me before, and it turned out that I wasn't specifying the new notebook directory correctly. I have had two mysterious cases of worksheets disappearing from the noteboook (in the sense that they didn't show up but the files were still there), but not what you are describing. And I have moved the notebook location around. -M. Hampton On May 15, 2:09 pm, shahab [EMAIL PROTECTED] wrote: I copied sage 3.0 binary to a different location (which worked fine). I also moved the directory sage_notebook to a different location. When I start the notebook pointed to this new directory, it starts fine but all the users info are gone. All the worksheets are still there. If I add a user to the account (same username as before), none of the worksheets show up. Creating a new worksheet just adds a worksheet to the preexisting directory for that user. How can I get access to the old worksheets? Thanks in advance, Shahab --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Sage Notebook Transfer
I have made that mistake before but this time the path is correct. The user folders under the /worksheet exist and once I added a new user with the same name (user1) to the server, nothing shows up in the new notebook window. But when I create a new worksheet for this user1, the worksheet folder is now placed in the correct location (worksheet/ user1/XX) where XX is the next highest number based on the folders that exist there (but can't be accessed). I think I'll just manually copy each worksheet text into a new notebook session and a new directory. Thx Shahab On May 15, 4:04 pm, Marshall Hampton [EMAIL PROTECTED] wrote: Are you certain that you are getting the new path correct? I've thought that this happened to me before, and it turned out that I wasn't specifying the new notebook directory correctly. I have had two mysterious cases of worksheets disappearing from the noteboook (in the sense that they didn't show up but the files were still there), but not what you are describing. And I have moved the notebook location around. -M. Hampton On May 15, 2:09 pm, shahab [EMAIL PROTECTED] wrote: I copied sage 3.0 binary to a different location (which worked fine). I also moved the directory sage_notebook to a different location. When I start the notebook pointed to this new directory, it starts fine but all the users info are gone. All the worksheets are still there. If I add a user to the account (same username as before), none of the worksheets show up. Creating a new worksheet just adds a worksheet to the preexisting directory for that user. How can I get access to the old worksheets? Thanks in advance, Shahab --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] 3 == pi
Is this a bug? sage: 3 == pi 3 == pi sage: i == i I == I Shouldn't this return False and True, respectively? I know this works: sage: 3 == pi.n() False sage: 3 == RR(pi) False but I sort of expect pi to act like the number pi when used with things like == or , without using the .n() decoration. --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: 3 == pi
On Thu, May 15, 2008 at 9:48 PM, John H Palmieri [EMAIL PROTECTED] wrote:
Is this a bug?
sage: 3 == pi
3 == pi
sage: i == i
I == I
Shouldn't this return False and True, respectively?
Those are symbolic equations:
sage: type(I == I)
class 'sage.calculus.equations.SymbolicEquation'
It's just a more general case of:
sage: var('a,b,c,x')
(a, b, c, x)
sage: a*x^2 + b*x + c == 0
a*x^2 + b*x + c == 0
sage: type(a*x^2 + b*x + c == 0)
class 'sage.calculus.equations.SymbolicEquation'
sage: solve(a*x^2 + b*x + c == 0, x)
[x == (-sqrt(b^2 - 4*a*c) - b)/(2*a), x == (sqrt(b^2 - 4*a*c) - b)/(2*a)]
That said, maybe something so obvious as I == I would best be simplified
to True. But then people would argue that it is very inconsistent that
sometimes symbolic equations are simplified to True/False and sometimes
they aren't.
In all cases you can do bool( a symbolic equation ) to get True or False.
sage: bool(I == I)
True
I know this
works:
sage: 3 == pi.n()
False
sage: 3 == RR(pi)
False
but I sort of expect pi to act like the number pi when used with
things like == or , without using the .n() decoration.
Nope. Pi is symbolic.
I'm certainly open to doing some simplification to True/False of symbolic
equalities though, when we can do so. I think the main reason we don't
now is simply that nobody implemented it. Comments welcome.
-- William
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[sage-support] Re: 3 == pi
On May 15, 9:56 pm, William Stein [EMAIL PROTECTED] wrote:
On Thu, May 15, 2008 at 9:48 PM, John H Palmieri [EMAIL PROTECTED] wrote:
Is this a bug?
sage: 3 == pi
3 == pi
sage: i == i
I == I
Shouldn't this return False and True, respectively?
Those are symbolic equations:
sage: type(I == I)
class 'sage.calculus.equations.SymbolicEquation'
It's just a more general case of:
sage: var('a,b,c,x')
(a, b, c, x)
sage: a*x^2 + b*x + c == 0
a*x^2 + b*x + c == 0
sage: type(a*x^2 + b*x + c == 0)
class 'sage.calculus.equations.SymbolicEquation'
sage: solve(a*x^2 + b*x + c == 0, x)
[x == (-sqrt(b^2 - 4*a*c) - b)/(2*a), x == (sqrt(b^2 - 4*a*c) - b)/(2*a)]
Yes, except I, pi, and e are constants, not variables.
I suppose bug is not the right word, but I would content that this
behavior is not at all what beginning users will expect. I mean, if I
can do 'e**(i * pi)' and get -1, I would expect to be able to do '3 ==
pi' and get False.
Or maybe I should say, if I can do 'a = 5; a == 7' and get False, I
would expect to be able to do '3 == pi' and get False. Why is pi
treated as a symbolic variable and not as a number?
(Think about this from the beginning user's point of view. If they
see odd behavior, they're going to be confused. A goal should be to
not let this happen, or to provide a good way for them to figure out
why the behavior was actually reasonable in the first place. How do
you expect someone to react when they type in '3 == pi'? If they're
puzzled, what do you reasonably expect them to be able to do to
clarify things?)
That said, maybe something so obvious as I == I would best be simplified
to True. But then people would argue that it is very inconsistent that
sometimes symbolic equations are simplified to True/False and sometimes
they aren't.
In all cases you can do bool( a symbolic equation ) to get True or False.
sage: bool(I == I)
True
I know this
works:
sage: 3 == pi.n()
False
sage: 3 == RR(pi)
False
but I sort of expect pi to act like the number pi when used with
things like == or , without using the .n() decoration.
Nope. Pi is symbolic.
I'm certainly open to doing some simplification to True/False of symbolic
equalities though, when we can do so. I think the main reason we don't
now is simply that nobody implemented it. Comments welcome.
-- William
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[sage-support] Re: 3 == pi
On Thu, May 15, 2008 at 10:42 PM, John H Palmieri
[EMAIL PROTECTED] wrote:
On May 15, 9:56 pm, William Stein [EMAIL PROTECTED] wrote:
On Thu, May 15, 2008 at 9:48 PM, John H Palmieri [EMAIL PROTECTED] wrote:
Is this a bug?
sage: 3 == pi
3 == pi
sage: i == i
I == I
Shouldn't this return False and True, respectively?
Those are symbolic equations:
sage: type(I == I)
class 'sage.calculus.equations.SymbolicEquation'
It's just a more general case of:
sage: var('a,b,c,x')
(a, b, c, x)
sage: a*x^2 + b*x + c == 0
a*x^2 + b*x + c == 0
sage: type(a*x^2 + b*x + c == 0)
class 'sage.calculus.equations.SymbolicEquation'
sage: solve(a*x^2 + b*x + c == 0, x)
[x == (-sqrt(b^2 - 4*a*c) - b)/(2*a), x == (sqrt(b^2 - 4*a*c) - b)/(2*a)]
Yes, except I, pi, and e are constants, not variables.
They are elements of the symbolic ring:
sage: parent(I)
Symbolic Ring
sage: parent(pi)
Symbolic Ring
sage: parent(e)
Symbolic Ring
I'm not claiming to tell you the ultimate way things should be. I'm only
explaining why they work the way they were and they do.
I suppose bug is not the right word, but I would content that this
behavior is not at all what beginning users will expect. I mean, if I
can do 'e**(i * pi)' and get -1, I would expect to be able to do '3 ==
pi' and get False.
Or maybe I should say, if I can do 'a = 5; a == 7' and get False, I
would expect to be able to do '3 == pi' and get False. Why is pi
treated as a symbolic variable and not as a number?
Pi is an element of the symbolic ring. What ring would you want
it to be part of? There is no ring of numbers in Sage. There could
be I suppose, but there isn't at present.
(Think about this from the beginning user's point of view. If they
see odd behavior, they're going to be confused. A goal should be to
not let this happen, or to provide a good way for them to figure out
why the behavior was actually reasonable in the first place. How do
you expect someone to react when they type in '3 == pi'? If they're
puzzled, what do you reasonably expect them to be able to do to
clarify things?)
I would prefer 3 == pi to return False. See below. Want to make
a Sage Enhancement Proposal and implement it? :-) It would
go something like this:
Sage Enhancement Proposal: Change comparisons that involve
elements of the symbolic ring to return True or False if both sides
of the symbolic comparison are constants and the comparison can
be definitely determined. [...] There would be a discussion on sage-devel,
probably some voting, and then it would get done.
That said, maybe something so obvious as I == I would best be simplified
to True. But then people would argue that it is very inconsistent that
sometimes symbolic equations are simplified to True/False and sometimes
they aren't.
In all cases you can do bool( a symbolic equation ) to get True or False.
sage: bool(I == I)
True
I know this
works:
sage: 3 == pi.n()
False
sage: 3 == RR(pi)
False
but I sort of expect pi to act like the number pi when used with
things like == or , without using the .n() decoration.
Nope. Pi is symbolic.
I'm certainly open to doing some simplification to True/False of symbolic
equalities though, when we can do so. I think the main reason we don't
now is simply that nobody implemented it. Comments welcome.
-- William
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
--~--~-~--~~~---~--~~
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