Re: [sage-support] Re: how to change show() defaults for 2D plots
Mike Hansen wrote: On Sun, Jul 11, 2010 at 5:48 AM, Johannes johannes.huis...@gmail.com wrote: Sorry for posting twice. I just noticed that my first message got through all right, though I did not receive it myself! Is this a common behaviour of google groups? Yes, this is a common behavior of Google Groups and Gmail. You can set defaults in the plot.options dictionary. sage: plot.options['frame'] = False Thanks, but I did try that. It doesn't make any difference, in any case in sage version 4.4.3 that I'm running. In fact, the sage dictionary plot.options does not contain the keyword 'frame'. So, setting it to False is, of course possible, but seemingly without any effect. Johan -- http://pageperso.univ-brest.fr/~huisman -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Re: how to change show() defaults for 2D plots
On Mon, Jul 12, 2010 at 8:57 AM, Johannes Huisman johannes.huis...@gmail.com wrote: Mike Hansen wrote: On Sun, Jul 11, 2010 at 5:48 AM, Johannes johannes.huis...@gmail.com wrote: Sorry for posting twice. I just noticed that my first message got through all right, though I did not receive it myself! Is this a common behaviour of google groups? Yes, this is a common behavior of Google Groups and Gmail. You can set defaults in the plot.options dictionary. sage: plot.options['frame'] = False Thanks, but I did try that. It doesn't make any difference, in any case in sage version 4.4.3 The above changes the options for the plot command. The poster is asking about changing the default options for the show command.I don't think Sage supports this yet. We implemented 3d plotting after 2d plotting, hence 3d plotting got some features that 2d plotting obviously should have... William that I'm running. In fact, the sage dictionary plot.options does not contain the keyword 'frame'. So, setting it to False is, of course possible, but seemingly without any effect. Johan -- http://pageperso.univ-brest.fr/~huisman -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org -- William Stein Professor of Mathematics University of Washington http://wstein.org -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: Pattern matching of a symbolic function acting on a symbolic variable
On Jul 11, 12:22 pm, William Stein wst...@gmail.com wrote: On Sat, Jul 10, 2010 at 10:04 PM, David Sanders dpsand...@gmail.com wrote: On Jul 10, 10:01 pm, David Sanders dpsand...@gmail.com wrote: Hi, Following up from a couple of my previous posts, I am now wondering how to do symbolic pattern matching for an expression of the following form: Apologies for replying to my own post, but I was wondering if there's any documentation I should be reading about this stuff, rather than posting every naive question here? (Although maybe it's actually useful to post naive questions here!) Maybe http://sagemath.org/doc/reference/calculus.html I'm curious if you had any trouble finding this. It's very easy -- just click Documentation, then Reference from the sage homepage. Thanks, I had seen this, I think via a Google search, but I did not explore it enough. I guess I was confused by the title 'calculus' instead of 'symbolic manipulation' -- I assumed it was just about differentiation etc. By the way, a minor but important point: the typographical conventions on this page (and many others) are not consistent: some of the titles have every word with an initial capital, whereas some have only the first word and proper names capitalized (my preference). Some have full stops (points) at the end, and others don't (my preference). Personally I have never liked monolithic pages with all possible information, such as http://sagemath.org/doc/reference/sage/symbolic/expression.html It is very difficult to navigate and find what you are looking for. Perhaps the examples could somehow be hidden until you hit a relevant link, at which point they reveal themselves. I suppose the page is probably automatically generated, but it would be more helpful to split it up into bitesize pieces. For example, there is a lot of noise generated by obvious functions like sin, cos etc. Finding the relevant bit about how to do pattern matching is not easy, for example. (Especially if you don't know that what you need is pattern matching!) In general, I find that the documentation is difficult to navigate for a Sage beginner. It is not clear what level each document is at. Even the order of the documents in the Sage standard documentation hides A tour of Sage, for example, amid more advanced documents. Of course, I realise that writing documentation is difficult! Perhaps it would be useful to have a kind of beginner's page, which lists a suggested order in which to read the different types of documentation. David. William -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: Pattern matching of a symbolic function acting on a symbolic variable
On Jul 11, 8:13 pm, ma...@mendelu.cz ma...@mendelu.cz wrote: On 11 čnc, 12:22, William Stein wst...@gmail.com wrote: On Sat, Jul 10, 2010 at 10:04 PM, David Sanders dpsand...@gmail.com wrote: Maybe http://sagemath.org/doc/reference/calculus.html Perhaps alsohttp://www.ginac.de/tutorial/Pattern-matching-and-advanced-substituti... OK, that is also useful, thanks. In particular, I notice that there is the concept of indexed objects in GiNaC. Is this accessible from Sage? Or pass to Maxima and use pattern matching from Maxima, which is well documented in documantation to Maxima. I am now confused about which system is used for the symbolics in Sage? Is it GiNaC, or Maxima, or a mixture? How can I find out which system is being used for which operation? I would very much prefer not to have to learn Maxima if I can help it, since the whole point is that Sage is supposed to provide the nice, coherent interface which makes this unnecessary! I also note that after reading the documentation, I am still left without an answer to my original question, which is how to do pattern matching in Sage (or if it's even possible) for something of the form f(i) ! David. Robert -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] How to plot regions defined by inequalities in 3D?
Hi, I have been playing around with the implicit_plot3d command, and it's very nice. Is there something similar to plot regions defined by inequalities in 3D, along the lines of the Mathematica RegionPlot3D command? I see that there is an old discussion from 2 years ago about this. It seems to me (in my ignorance) that the kind of algorithm required to do this should not be too different from that for implicit_plot3d with the region option. (Though implicit_plot3d draws surfaces, whereas region_plot3d would draw volumes. But apparently the marching cubes algorithm is used for both?) Thanks and best wishes, David. -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: Notebooks forgets assignments
Hi, Thanks for the answers and sorry for the late reply. The parameters for running the notebook server are: /usr/local/sage-4.3.2/sage -python notebook.py on notebook.py: from sage.all import * notebook(directory='/home/nbuser/nbfiles', port=8000, accounts=True, address='', ulimit='-u 100 -v 300 -t 3600', open_viewer=False, timeout=120, secure=True, server_pool=['nbu...@localhost']) I guess that the problem is with the timeout parameter. Which would be a reasonable value? Thanks again, Joaquim Puig On Jul 10, 7:07 am, William Stein wst...@gmail.com wrote: On Sat, Jul 10, 2010 at 2:48 AM, Mike Hansen mhan...@gmail.com wrote: 2010/7/9 Jorge E. ´Sanchez Sanchez hnr...@hotmail.com: Which could be the problem? Thanks in advance, It sounds like the issue could be that the notebook closes the worksheet session after that amount of inactivity. Then, when you execute the next command it starts up a new session in which a hasn't been defined. That's what it sounds like. How *exactly* do you run the notebook server? William --Mike -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group athttp://groups.google.com/group/sage-support URL:http://www.sagemath.org -- William Stein 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 sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Re: Notebooks forgets assignments
On Mon, Jul 12, 2010 at 11:29 AM, Joaquim Puig joaquim.p...@gmail.com wrote: Hi, Thanks for the answers and sorry for the late reply. The parameters for running the notebook server are: /usr/local/sage-4.3.2/sage -python notebook.py on notebook.py: from sage.all import * notebook(directory='/home/nbuser/nbfiles', port=8000, accounts=True, address='', ulimit='-u 100 -v 300 -t 3600', open_viewer=False, timeout=120, secure=True, server_pool=['nbu...@localhost']) I guess that the problem is with the timeout parameter. Which would be a reasonable value? You set it to *2 minutes*. That's probably not so reasonable. Maybe timeout = 3600? Thanks again, Joaquim Puig On Jul 10, 7:07 am, William Stein wst...@gmail.com wrote: On Sat, Jul 10, 2010 at 2:48 AM, Mike Hansen mhan...@gmail.com wrote: 2010/7/9 Jorge E. ´Sanchez Sanchez hnr...@hotmail.com: Which could be the problem? Thanks in advance, It sounds like the issue could be that the notebook closes the worksheet session after that amount of inactivity. Then, when you execute the next command it starts up a new session in which a hasn't been defined. That's what it sounds like. How *exactly* do you run the notebook server? William --Mike -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group athttp://groups.google.com/group/sage-support URL:http://www.sagemath.org -- William Stein 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 sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org -- William Stein Professor of Mathematics University of Washington http://wstein.org -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Re: Pattern matching of a symbolic function acting on a symbolic variable
Hi David, On Mon, 12 Jul 2010 02:24:41 -0700 (PDT) David Sanders dpsand...@gmail.com wrote: On Jul 11, 8:13 pm, ma...@mendelu.cz ma...@mendelu.cz wrote: On 11 čnc, 12:22, William Stein wst...@gmail.com wrote: On Sat, Jul 10, 2010 at 10:04 PM, David Sanders dpsand...@gmail.com wrote: Maybe http://sagemath.org/doc/reference/calculus.html Perhaps alsohttp://www.ginac.de/tutorial/Pattern-matching-and-advanced-substituti... OK, that is also useful, thanks. In particular, I notice that there is the concept of indexed objects in GiNaC. Is this accessible from Sage? There is an experimental patch. I'm really busy these days, but this is close to the top of my list. :) http://groups.google.com/group/sage-devel/t/69ab50fe11672111 Or pass to Maxima and use pattern matching from Maxima, which is well documented in documantation to Maxima. I am now confused about which system is used for the symbolics in Sage? Is it GiNaC, or Maxima, or a mixture? How can I find out which system is being used for which operation? It's a mixture, though we are trying to move as much as possible to GiNaC and native Sage. AFAIK, the only way to tell what is being used is to read the code. As a general rule, basic arithmetic and pattern matching is done with GiNaC, more advanced functionality, limits, simplification, factorization, etc. calls maxima. I would very much prefer not to have to learn Maxima if I can help it, since the whole point is that Sage is supposed to provide the nice, coherent interface which makes this unnecessary! I can totally understand that. We definitely need to improve the interface to cover this functionality. Thanks for pointing it out. I also note that after reading the documentation, I am still left without an answer to my original question, which is how to do pattern matching in Sage (or if it's even possible) for something of the form f(i) ! I don't think this is supported by GiNaC expressions at the moment. If using wildcards for functions is available in GiNaC, we can wrap it easily. Implementing it would take more time though. Can you ask the GiNaC list if this is possible purely using GiNaC (from C++)? Cheers, Burcin -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: Notebooks forgets assignments
Thanks! I will try it this way. Joaquim Puig On Jul 12, 11:42 am, William Stein wst...@gmail.com wrote: On Mon, Jul 12, 2010 at 11:29 AM, Joaquim Puig joaquim.p...@gmail.com wrote: Hi, Thanks for the answers and sorry for the late reply. The parameters for running the notebook server are: /usr/local/sage-4.3.2/sage -python notebook.py on notebook.py: from sage.all import * notebook(directory='/home/nbuser/nbfiles', port=8000, accounts=True, address='', ulimit='-u 100 -v 300 -t 3600', open_viewer=False, timeout=120, secure=True, server_pool=['nbu...@localhost']) I guess that the problem is with the timeout parameter. Which would be a reasonable value? You set it to *2 minutes*. That's probably not so reasonable. Maybe timeout = 3600? Thanks again, Joaquim Puig On Jul 10, 7:07 am, William Stein wst...@gmail.com wrote: On Sat, Jul 10, 2010 at 2:48 AM, Mike Hansen mhan...@gmail.com wrote: 2010/7/9 Jorge E. ´Sanchez Sanchez hnr...@hotmail.com: Which could be the problem? Thanks in advance, It sounds like the issue could be that the notebook closes the worksheet session after that amount of inactivity. Then, when you execute the next command it starts up a new session in which a hasn't been defined. That's what it sounds like. How *exactly* do you run the notebook server? William --Mike -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group athttp://groups.google.com/group/sage-support URL:http://www.sagemath.org -- William Stein 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 sage-support+unsubscr...@googlegroups.com For more options, visit this group athttp://groups.google.com/group/sage-support URL:http://www.sagemath.org -- William Stein 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 sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: Pattern matching of a symbolic function acting on a symbolic variable
On Jul 12, 12:19 pm, Burcin Erocal bur...@erocal.org wrote:
Hi David,
On Mon, 12 Jul 2010 02:24:41 -0700 (PDT)
David Sanders dpsand...@gmail.com wrote:
On Jul 11, 8:13 pm, ma...@mendelu.cz ma...@mendelu.cz wrote:
On 11 čnc, 12:22, William Stein wst...@gmail.com wrote:
On Sat, Jul 10, 2010 at 10:04 PM, David Sanders
dpsand...@gmail.com wrote:
Maybe
http://sagemath.org/doc/reference/calculus.html
Perhaps
alsohttp://www.ginac.de/tutorial/Pattern-matching-and-advanced-substituti...
OK, that is also useful, thanks.
In particular, I notice that there is the concept of indexed objects
in GiNaC.
Is this accessible from Sage?
There is an experimental patch. I'm really busy these days, but this is
close to the top of my list. :)
OK great, thanks!
http://groups.google.com/group/sage-devel/t/69ab50fe11672111
Or pass to Maxima and use pattern matching from Maxima, which is
well documented in documantation to Maxima.
I am now confused about which system is used for the symbolics in
Sage? Is it GiNaC, or Maxima, or a mixture? How can I find out which
system is being used for which operation?
It's a mixture, though we are trying to move as much as possible to
GiNaC and native Sage. AFAIK, the only way to tell what is being used
is to read the code. As a general rule, basic arithmetic and pattern
matching is done with GiNaC, more advanced functionality, limits,
simplification, factorization, etc. calls maxima.
I see, thanks for the clarification. The structure is gradly becoming
clearer to me.
I have been looking at GiNaC a bit, and it seems to be very clean.
I would very much prefer not to have to learn Maxima if I can help it,
since the whole point is that Sage is supposed to provide the nice,
coherent interface which makes this unnecessary!
I can totally understand that. We definitely need to improve the
interface to cover this functionality. Thanks for pointing it out.
I also note that after reading the documentation, I am still left
without an answer to my original question, which is how to do pattern
matching in Sage (or if it's even possible) for something of the
form
f(i) !
I don't think this is supported by GiNaC expressions at the moment. If
using wildcards for functions is available in GiNaC, we can wrap it
easily. Implementing it would take more time though. Can you ask the
GiNaC list if this is possible purely using GiNaC (from C++)?
Actually, from browsing the documentation, I can't even find symbolic
functions in GiNaC like
f = function('f')
in Sage.
Does this exist in GiNaC? Does the above Sage statement reference
something in GiNaC? If so, what?
(I tried to answer this question myself using
function?
function??
in Sage, but this just said that it was a built-in function, and gave
me neither the name of a file, nor the source code.
Is there another way of getting information about this?)
Thanks,
David.
Cheers,
Burcin
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[sage-support] Non-Linear Programming in Sage
After reading through the documentation, it doesn't look like sage can solve a non-linear program. Is this correct? -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: How to plot regions defined by inequalities in 3D?
On Jul 12, 2:28 am, David Sanders dpsand...@gmail.com wrote:
Hi,
I have been playing around with the implicit_plot3d command, and it's
very nice.
Is there something similar to plot regions defined by inequalities in
3D, along the lines of the Mathematica
RegionPlot3D command? I see that there is an old discussion from 2
years ago about this.
It seems to me (in my ignorance) that the kind of algorithm required
to do this should not be too different from that for implicit_plot3d
with the region option. (Though implicit_plot3d draws surfaces,
whereas region_plot3d would draw volumes. But apparently the marching
cubes algorithm is used for both?)
I haven't looked at this stuff in more than a year, but I think this
is all accurate:
Our plotting framework doesn't really understand volumes, only
surfaces. So it would be a major overhaul to produce a plot that
showed (via some sort of volumetric shading, say) the difference
between the inside and the outside of your region.
However, if you want to produce a plot of the surface of your region,
that's pretty easy. If your region is defined by a single inequality
F(x,y,z)0, then you can just implicit_plot3d F(x,y,z). If your
region is defined as a boolean combination of inequalities, then
arrange all the inequalities to be of the form F(x,y,z) 0, then drop
all the 0, replace and with max_symbolic, replace or with
min_symbolic, and replace not F(x,y,z) with -F(x,y,z). Also,
when you plot, because of http://trac.sagemath.org/sage_trac/ticket/9483
you need to add smooth=False.
Here's a complete example. This forms the intersection between a cube
and the union of two cylinders.
sage: var('x,y,z')
(x, y, z)
sage: implicit_plot3d(max_symbolic(min_symbolic(x*x+y*y-1, x*x+z*z-2),
x-1.8, y-1.8, z-1.8, -x-1.8, -y-1.8, -z-1.8), (x, -2, 2), (y, -2, 2),
(z, -2, 2), smooth=False)
It would be great to put all of this into a region_plot3d command, but
as far as I know, Sage does not yet support symbolic conjunctions and
disjunctions (ands and ors); so it would be difficult to tell
region_plot3d about any region more complicated than a single
inequality.
Carl
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RE: [sage-support] Non-Linear Programming in Sage
Sage comes with the library cvxopt preinstalled, so you can solve non-linear problems. Regards Jorge Date: Mon, 12 Jul 2010 10:09:40 -0700 Subject: [sage-support] Non-Linear Programming in Sage From: alexander.r.strac...@gmail.com To: sage-support@googlegroups.com After reading through the documentation, it doesn't look like sage can solve a non-linear program. Is this correct? -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org _ ¿Qué signigica Messenger para ti? www.vivirmessenger.com -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: Non-Linear Programming in Sage
On Jul 12, 7:09 pm, Alexander Strachan alexander.r.strac...@gmail.com wrote: After reading through the documentation, it doesn't look like sage can solve a non-linear program. Is this correct? There is minimize and minimize_constraint wrapping different solvers. http://www.sagemath.org/doc/reference/sage/numerical/optimize.html H -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: How to plot regions defined by inequalities in 3D?
On Jul 12, 7:29 pm, Carl Witty carl.wi...@gmail.com wrote:
On Jul 12, 2:28 am, David Sanders dpsand...@gmail.com wrote:
Hi,
I have been playing around with the implicit_plot3d command, and it's
very nice.
Is there something similar to plot regions defined by inequalities in
3D, along the lines of the Mathematica
RegionPlot3D command? I see that there is an old discussion from 2
years ago about this.
It seems to me (in my ignorance) that the kind of algorithm required
to do this should not be too different from that for implicit_plot3d
with the region option. (Though implicit_plot3d draws surfaces,
whereas region_plot3d would draw volumes. But apparently the marching
cubes algorithm is used for both?)
I haven't looked at this stuff in more than a year, but I think this
is all accurate:
Our plotting framework doesn't really understand volumes, only
surfaces. So it would be a major overhaul to produce a plot that
showed (via some sort of volumetric shading, say) the difference
between the inside and the outside of your region.
Yes, I agree, although that overhaul could well be worth it!
However, if you want to produce a plot of the surface of your region,
that's pretty easy. If your region is defined by a single inequality
F(x,y,z)0, then you can just implicit_plot3d F(x,y,z). If your
region is defined as a boolean combination of inequalities, then
arrange all the inequalities to be of the form F(x,y,z) 0, then drop
all the 0, replace and with max_symbolic, replace or with
min_symbolic, and replace not F(x,y,z) with -F(x,y,z). Also,
when you plot, because ofhttp://trac.sagemath.org/sage_trac/ticket/9483
you need to add smooth=False.
Here's a complete example. This forms the intersection between a cube
and the union of two cylinders.
sage: var('x,y,z')
(x, y, z)
sage: implicit_plot3d(max_symbolic(min_symbolic(x*x+y*y-1, x*x+z*z-2),
x-1.8, y-1.8, z-1.8, -x-1.8, -y-1.8, -z-1.8), (x, -2, 2), (y, -2, 2),
(z, -2, 2), smooth=False)
It would be great to put all of this into a region_plot3d command, but
as far as I know, Sage does not yet support symbolic conjunctions and
disjunctions (ands and ors); so it would be difficult to tell
region_plot3d about any region more complicated than a single
inequality.
OK, thanks, I had come to a similar conclusion, though the trick with
max_ and min_symbolic is neat.
For the moment I think this will do most of the things that I need,
but the fact that there are no symbolic and's and or's
makes it quite (=very) messy if there are multiple intersecting
volumes which restrict each other.
Thanks,
David.
Carl
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[sage-support] How to use R's untar in Sage?
I've tried to use R's untar command a number of different ways from Sage's commandline interface and I am having trouble listing the contents of a LZMA compressed TAR file. Actually, I don't seem to get any desirable output from r.untar so I am thinking I'm not even close to using the correct syntax. If I have a LZMA compressed TAR file, how can I list/read it with Sage and/or r.untar in Sage? Cheers! -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: How to use R's untar in Sage?
On Jul 12, 10:57 pm, rickhg12hs rickhg1...@gmail.com wrote: I've tried to use R's untar command a number of different ways from Sage's commandline interface and I am having trouble listing the contents of a LZMA compressed TAR file. Actually, I don't seem to get any desirable output from r.untar so I am thinking I'm not even close to using the correct syntax. Syntax with R commands is not always obvious for optional keywords. Can you give us the *exact* R command (with options) you are trying to use? Note the documentation: What options are supported will depend on the ‘tar’ used. So it is possible that the R untar in question on Sage behaves differently from a 'native' implementation. But most likely it is the use of options that is the problem. Unfortunately I can't remember offhand how I've used them in the past :( but perhaps someone else will. If I have a LZMA compressed TAR file, how can I list/read it with Sage and/or r.untar in Sage? If you are just trying to use R from within Sage, without integrating it with the rest of Sage, you can also use r_console(), or use %r in the notebook, and just do things that way. - kcrisman -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
