[sage-support] Re: parametric_plot3d appears to not give the correct axes values, also steals keyboard
I filed a ticket at http://trac.sagemath.org/sage_trac/ticket/6002. -- Bill --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: parametric_plot3d appears to not give the correct axes values, also steals keyboard
On Wed, May 6, 2009 at 12:28 PM, Alden alden.wal...@gmail.com wrote: 0) sagenb.com is awesome, especially since Mathematica 7 takes up 100% of my processor at all times under Ubuntu 9.04. Glad to hear it :). 1) When I run: parametric_plot( (cos(t), sqrt(2)*sin(t)) , (t,0,2*pi)) I get a nice 2d parametric plot, with the top of the ellipse clearly hitting close to 1.5 on the y-axis. When I run: parametric_plot3d( (cos(t), 1 , sqrt(2)*sin(t)), (t,0,2*pi)) The top of the ellipse really looks like it's at z=1, and the whole thing looks a lot like a circle. I realize that this is probably not a problem with sage and rather with whatever is doing the plotting, but I thought I should point it out. I think that this is a bug, but I can't find the source of the error very easily. I will open a Trac ticket to address this issue. Thanks for pointing it out! 2) Also, after clicking and dragging on the 3d plot, I can't type anywhere in firefox (the notebook or the address bar) until I click onto another tab and then back again. This may be a problem with java in my browser not taking the keyboard away from the applet. That's odd. Do you mean to say that even when you try to move focus away from the Java applet using your mouse, input is still captured? I myself use Sage on vanilla Ubuntu 9.0.4 with no difficulties. Maybe the problem is with your Java or web browser configuration. 3-more of a feature request than an error I guess) I have noticed from googling that there has been some discussion about creating a function from R^n to R^m. I am sure there is some good reason why this isn't the case, but I was curious about whether it would be possible to just automatically map everything over tuples of symbolic expressions, or make a tuple of symbolic expressions a symbolic expression itself. For example, why couldn't diff( (t, 2*t), t) (which gives the error that a tuple is not a symbolic expression) notice that the tuple is a tuple of symbolic expressions, and then just map itself over it to get (1,2). Also, then defining f(x,y) = (2*x, 2*y) seems like it would work. Similarly, what if there was a dot product function which just did the obvious thing when it was given two tuples of symbolic expressions? The reason that I am thinking about this is that it would be really awesome if I could tell my vector calculus class to do a line integral by defining what f(c(t)) =fc(t) and c(t) are and then just: integrate( dot( fc(t), diff( c(t), t), t, 0, 2*pi) rather than something like integrate( vector( (t,t^2,t^3) ).dot_product( diff( vector( (t,t,t) ), t ) ), t,0,2*pi) which is a little less intuitive. To address your diff example: it is simple enough in this case to do [diff(f, t) for f in (t, 2*t)]. I don't know what work is being done in Sage to help work with vector-valued functions, but maybe someone more familiar with the symbolic calculus component can chime in. One way to improve your line integral example would be to refactor it into a Python function in terms of f and fc, so that students could simply type: line_integral(f, fc). But since this is a math class, I understand if you do not want to go that in-depth into programming techniques. -- Bill --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Jmol works from command line, but not notebook
Hello,
Jmol is not working for me from the notebook, but works fine from the
command line. I'm using 3.4.1 in Ubuntu Jaunty, with Firefox and the
icedtea Java plugin.
When I do this in a terminal, a Jmol window pops up and works great:
sage: u, v = var('u, v')
sage: parametric_plot3d([u*v, u, v^2], (u, -1,1), (v,-1,1))
The same commands in the notebook result in a black Jmol window and the
error message Jmol script terminated in the bottom bar of Firefox.
Here's the error messages printed to the terminal by Firefox:
Jmol applet jmolApplet1__440664173941044__ destroyed
Jmol applet jmolApplet2__440664173941044__ initializing
AppletRegistry.checkIn(jmolApplet2__440664173941044__)
urlImage=jar:file:/home/drake/.icedteaplugin/cache/https/sagenb.kaist.ac.kr/java/jmol/JmolApplet0.jar!/jmol75x29x8.gif
applet context: -applet
appletDocumentBase=https://sagenb.kaist.ac.kr:8022/home/admin/0/
appletCodeBase=https://sagenb.kaist.ac.kr:8022/java/jmol/
(C) 2008 Jmol Development
Jmol Version 11.6.16 2008-11-24 13:39
java.vendor:Sun Microsystems Inc.
java.version:1.6.0_0
os.name:Linux
memory:44.7/71.8
useCommandThread: false
appletId:jmolApplet2__440664173941044__
FileManager opening
https://sagenb.kaist.ac.kr:8022/java/jmol/appletweb/SageMenu.mnu
defaults = Jmol
backgroundColor = black
language=en_US
FileManager opening
https://sagenb.kaist.ac.kr:8022/home/admin/0/cells/3/sage0-size500.jmol?1241679757
script compiler ERROR: command expected
line 1 command 1 of /home/admin/0/cells/3/sage0-size500.jmol?1241679757:
!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.01//EN
script ERROR: script compiler ERROR: command expected
line 1 command 1 of /home/admin/0/cells/3/sage0-size500.jmol?1241679757:
!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.01//EN
eval ERROR:
line 1 command 1:
script /home/admin/0/cells/3/sage0-size500.jmol?1241679757
The applet on the Jmol main page works fine, as well as their browser
check page. Other Java applets work fine.
A colleague here told me that Jmol wouldn't work for him at all, and
he was using IE and Chrome. (I'm not sure if he's having the same
problem, although he is using the same server.) Any ideas on what's wrong?
Dan
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- KAIST Department of Mathematical Sciences
--- http://mathsci.kaist.ac.kr/~drake
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[sage-support] Re: How to cimport a Sage extension class?
PS: I tested which of these are needed for cimport of RingElement, and I found that SAGE_ROOT+'/local/include/csage/' suffices. I forgot to tell: Plus SAGE_ROOT+/devel/sage/, Cheers, Simon --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] running maxima within sage and parallel computing
Dear All, I am not a software programmer. It is possible that this question is not rightly phrased. I use Maxima on a Ubuntu 9.04 i386 machine for symbolic computation tasks that arise in macroeconomics. I am given to understand that Maxima cannot exploit parallel computing at present while Sage can. I wish to know whether if i use Sage to run Maxima on a multicore computer (with a cpu such as AMD Phenom II X4 955 and related components that i shortly intend to set up) I will be able to gain in terms of computing speed with the parallel computing prowess of Sage. C. Saratchand --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: running maxima within sage and parallel computing
You could try to use dsage and running multiple instances in parallel. http://sagemath.org/doc/reference/sage/dsage/dsage.html Of course, you need to code something to split and combine the total workload for each client... h On May 7, 11:46 am, chand sarat chandcsa...@gmail.com wrote: Dear All, I am not a software programmer. It is possible that this question is not rightly phrased. I use Maxima on a Ubuntu 9.04 i386 machine for symbolic computation tasks that arise in macroeconomics. I am given to understand that Maxima cannot exploit parallel computing at present while Sage can. I wish to know whether if i use Sage to run Maxima on a multicore computer (with a cpu such as AMD Phenom II X4 955 and related components that i shortly intend to set up) I will be able to gain in terms of computing speed with the parallel computing prowess of Sage. C. Saratchand --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Jmol works from command line, but not notebook
Well, thanks to Jason Grout for helping me on IRC...installing the Sun Java plugin fixed the problem for me in Linux. However, now I'm home on my Macbook, and Jmol isn't working here! In Firefox, I get the same problem, where it's just a black box. Every other Java thing works here, including the Jmol stuff on their website, so this does seem like some kind of Sage or Firefox problem. Everything works fine in Safari, so it's not a system Java issue. Any ideas? Dan -- --- Dan Drake dr...@kaist.edu - KAIST Department of Mathematical Sciences --- http://mathsci.kaist.ac.kr/~drake signature.asc Description: Digital signature
[sage-support] strange characters in notebook
Hi, I am running Sage version 3.4.1 on a CentosOS5 Linux workstation. Sage is compiled from source. I am using the notebook interface through Firefox version 3.0.10 with jsMath v3.6a. In the notebook interface, when I evaluate the contents of a cell, the proper output is 'sandwiched' between sets of strange characters. I apologize for being ignorant as to what the characters are or represent, but there are some square boxes containing '001B' and the strings '[0m' and '[1;30m' repeated several times. I have tried previous versions of both Sage (v3.3) and Firefox (v3.0b5) and the problem is still there. Does anyone have any ideas as to what might be happening and how to fix the problem? Thank you for any help you can offer. -gyro --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: constructing a matrix from a list
On Thursday 07 May 2009, Christophe Oosterlynck wrote: Hi, in a cython project of mine, I need to do some intensive work on arrays and then use these list in a matrix product. Doing the intensive work on the arrays goes smoothly when using C arrays (using malloc). Afterwards I convert the C array to a python list and I construct a matrix over GF(2) from this array so I can use Sage's quick GF(2) matrix multiplication. I need to do this several times and it seems that constructing a matrix from a list is slowing everything down. Is the array a bit array or an int array with zeros and ones? If it is the former you might be able to just use some pointer arithmetic to convince M4RI that your array is its matrix. If it is the latter, it will be much quicker to write the C ints to the matrix directly instead of going through the list, something like this: cdef Py_ssize_t i, j for i from 0 = i x: for j from 0 = j y: mzd_write_bit(self._entries, i, j, a[i][j] % 2) if a is your two dimensional array. I want to combine my algorithm to do a transformation on an array with the possibility to do a matrix multiplication with the list I got from this algorithm. Is calling matrix(GF(2), x, z, list) the best way to do this? I find it very slow... The code which does the conversion is this: for i from 0 = i self._nrows: if PyErr_CheckSignals(): raise KeyboardInterrupt for j from 0 = j self._ncols: mzd_write_bit(self._entries,i,j, int(entries[k]) % 2) k = k + 1 The %2 is stupid and shouldn't be required but I'd need to fix mzd_write_bit first (it explicitly checks for 1 instead of !=0). I don't know how expensive the PyErr_CheckSignals() but the generic entries lookup + the int() are certainly expensive. Bottomline: it is quite generic code which could be made somewhat faster with some care. However, the solution above which avoids all Python data structures directly will always be fastest. Cheers, Martin -- name: Martin Albrecht _pgp: http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0x8EF0DC99 _otr: 47F43D1A 5D68C36F 468BAEBA 640E8856 D7951CCF _www: http://www.informatik.uni-bremen.de/~malb _jab: martinralbre...@jabber.ccc.de --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Multi-thread and factor(n) problems
I have a problem using factor() in a thread. Consider the following: sage: class FactorThread(Thread): : def run(self): : factor(2^50-1) : sage: test = FactorThread() sage: test.start() Exception in thread Thread-3: Traceback (most recent call last): File /Library/Sage/3.4/local/lib/python/threading.py, line 486, in __bootstrap_inner self.run() File ipython console, line 3, in run File /Library/Sage/3.4/local/lib/python2.5/site-packages/sage/rings/ arith.py, line 2027, in factor int_=int_, debug_level=verbose, proof=proof), unit) File /Library/Sage/3.4/local/lib/python2.5/site-packages/sage/rings/ arith.py, line 1849, in __factor_using_pari prev = pari.get_debug_level() File gen.pyx, line 7871, in sage.libs.pari.gen.PariInstance.get_debug_level (sage/libs/pari/gen.c: 32133) File gen.pyx, line 7859, in sage.libs.pari.gen.PariInstance.default (sage/libs/pari/gen.c:32038) File gen.pyx, line 9044, in sage.libs.pari.gen._pari_trap (sage/ libs/pari/gen.c:38611) PariError: (7) There seems to be a problem using pari in a new thread. Any suggestions? Should I report this on SageTrac? Jérôme Tremblay LaCIM, Montréal, Canada --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: strange characters in notebook
gyro wrote: Hi, I am running Sage version 3.4.1 on a CentosOS5 Linux workstation. Sage is compiled from source. I am using the notebook interface through Firefox version 3.0.10 with jsMath v3.6a. In the notebook interface, when I evaluate the contents of a cell, the proper output is 'sandwiched' between sets of strange characters. I apologize for being ignorant as to what the characters are or represent, but there are some square boxes containing '001B' and the strings '[0m' and '[1;30m' repeated several times. I have tried previous versions of both Sage (v3.3) and Firefox (v3.0b5) and the problem is still there. Does anyone have any ideas as to what might be happening and how to fix the problem? You're using a beta version of Firefox? Try using an official release. Apparently there have been problems with some beta versions and fonts, which affected jsmath displaying nice typeset mathematics. Jason --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: strange characters in notebook
Jason Grout wrote: gyro wrote: Hi, I am running Sage version 3.4.1 on a CentosOS5 Linux workstation. Sage is compiled from source. I am using the notebook interface through Firefox version 3.0.10 with jsMath v3.6a. Sorry, I should really get more sleep. It appears that you saw this with a released version of Firefox. Can you point out a specific published worksheet (like on sagenb.org) on which you see this problem. If you can, a screenshot showing us exactly what you are seeing would be helpful too. Thanks, Jason --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Sage for Scientific Grid
William Stein пишет: On Wed, May 6, 2009 at 6:43 PM, Serge A. Salamanka salsa-...@tut.by wrote: Hi all, To start with I'd like to describe my ideas about gridification of Sage. This task is a very common one nowadays but it is a challenge for me. The very first thing I'm asking myself is how to simplify this gridification. There are lots of tools that can be used at the moment and that is why the biggest question comes in mind: which one to use ? ... read further here: http://sageworldmath.blogspot.com/2009/05/sage-for-scientific-grid.html May be someone already has experience of enabling applications for Grid ? What are you trying to compute? William I'm trying to provide my colleagues from HEP with an alternative, free and sufficient computer algebra system that will also utilize Grid functionality. They all use Mathematica. There is an interest in GridMathematica but it is not available at all (due to its cost and very controlled distribution). I used it a lot but when I have to build a knowledge base on that expensive system, I always feel that some day it will be waisted at all. So I'd rather be on the hard way rather then someday come to a dead end. Computations can be of any sort... ... when you have 3000 CPUs # Serge --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: [sage-edu] 3d tubes in SAGE
Rado wrote:
Hello,
To test the 3D plotting abilities of sage, I tried to implement some
basic tube plotting like the ones here
http://facstaff.unca.edu/mcmcclur/java/LiveMathematica/tubes.html
(mathematica handles those beautifully).
The code is nice and short and I think the pretty picture that comes
out is good for SAGE posters or the show-off page in the wiki. To
compete with mathematica all that's left is putting nicer color
textures, but I don't know how to do that with JMOL.
(CCing sage-support, since this seems like it would be of wider interest)
This is nice! It's prettier than the shorter version:
curve = vector([sin(3*x), sin(x)+2*sin(2*x), cos(x)-2*cos(2*x)])
parametric_plot(list(curve), (x, 0, 2*pi),
thickness=30,aspect_ratio=[1,1,1])
Does anyone know why using the thickness keyword looks a little weird
(like balls strung together, rather than a tube)?
You can change the color by using the 'color' keyword. There are some
predefined colors, or you can specify an RGB numeric list.
curve = vector([sin(3*x), sin(x)+2*sin(2*x), cos(x)-2*cos(2*x)])
parametric_plot(list(curve), (x, 0, 2*pi),
thickness=30,aspect_ratio=[1,1,1], color='red')
Incidentally, I think the function should be changed to accept vectors,
so you don't have to put the list command in there to get it to plot.
#Original idea:
http://facstaff.unca.edu/mcmcclur/java/LiveMathematica/tubes.html
#SAGE translation: Radoslav Kirov
def vector_normalize(v):
return v/sqrt(v*v)
x,s = var('x,s')
curve = vector([sin(x), cos(x),0])
#if you are happy with the torus, try the trefoil knot
#curve = vector([sin(3*x), sin(x)+2*sin(2*x), cos(x)-2*cos(2*x)])
tangent = diff(curve,x)
unit_tangent = vector_normalize(tangent)
normal = diff(unit_tangent,x)
#alternative is to cross_product with a random vector. This might be
faster but will make picture uglier.
#you will probably, need to check that the tangent is not parallel to
[1,1,1].
#test_vector = vector([1,1,1])
#normal = (test_vector.cross_product(unit_tangent))
unit_normal = vector_normalize(normal)
unit_binormal = unit_normal.cross_product(unit_tangent)
radius = 0.3
parametric_plot3d(list(curve + radius * cos(s) * unit_normal + radius
* sin(s) * unit_binormal), (x,0,2*pi),(s,0,2*pi),aspect_ratio=[1,1,1])
Also, a warning for people who come from the world of Mathematica:
sage: v=Vector([2,1])
sage: v.normalize()
(1, 1/2)
I lost a good 15 min. on that. I am guessing this definition of
normalize comes from polynomials but its quite weird for regular
vector calculus.
Ouch. That seems really out of place for vectors. I agree it ought to
be changed.
Thanks,
Jason
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[sage-support] Re: parametric_plot3d appears to not give the correct axes values, also steals keyboard
thanks! On May 6, 11:33 pm, William Cauchois wcauc...@u.washington.edu wrote: I filed a ticket athttp://trac.sagemath.org/sage_trac/ticket/6002. -- Bill --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: strange characters in notebook
On May 7, 9:27 am, Jason Grout jason-s...@creativetrax.com wrote: Jason Grout wrote: gyro wrote: Hi, I am running Sage version 3.4.1 on a CentosOS5 Linux workstation. Sage is compiled from source. I am using the notebook interface through Firefox version 3.0.10 with jsMath v3.6a. Sorry, I should really get more sleep. It appears that you saw this with a released version of Firefox. Can you point out a specific published worksheet (like on sagenb.org) on which you see this problem. If you can, a screenshot showing us exactly what you are seeing would be helpful too. Thanks, Jason Hi Jason, Using the same browser, when I create a worksheet and evaluate expressions on sagenb.org, things look great. Regarding the screenshot, I am reading this newsgroup through the google groups webpage and can't include any attachments, nor can I add the image to the file section of this group. So, I uploaded the screenshot to a free picture hosting group: http://tinypic.com/view.php?pic=6qgmjps=5 (Sorry, I don't know any other way to let you view the image; any hints are appreciated) Thanks again for your help. -gyro --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Unexpected error during integration
Hi,
I am new to Sage and am trying to reproduce a well known result that
the Fourier Transform of an exponential decay function is a Lorentzian
function.
In other words, the integral of
exp(-abs(k)) * exp(-i2pi*k*x)
with respect to k, from 0 to +infinity (i'm integrating 0 to +inf
instead of -inf to +inf using symmetry),
should yield a Lorentzian function as the result
1/(1+x^2)
However, when I enter into my Sage notebook:
k,x = var('k,x')
f(k,x)=exp(-abs(k))*exp(-I*2*pi*k*x)
integrate(f,k,0,Infinity)
I get back this error:
Traceback (click to the left for traceback)
...
Computation failed due to a bug in Maxima -- NOTE: Maxima had to be
restarted.
If someone can help me understand what I might be doing incorrectly,
that would be greatly appreciated!
Thanks!
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[sage-support] Re: strange characters in notebook
gyro wrote: On May 7, 9:27 am, Jason Grout jason-s...@creativetrax.com wrote: Jason Grout wrote: gyro wrote: Hi, I am running Sage version 3.4.1 on a CentosOS5 Linux workstation. Sage is compiled from source. I am using the notebook interface through Firefox version 3.0.10 with jsMath v3.6a. Sorry, I should really get more sleep. It appears that you saw this with a released version of Firefox. Can you point out a specific published worksheet (like on sagenb.org) on which you see this problem. If you can, a screenshot showing us exactly what you are seeing would be helpful too. Thanks, Jason Hi Jason, Using the same browser, when I create a worksheet and evaluate expressions on sagenb.org, things look great. So have you only observed this on your notebook server? I'm not sure I can help more without being able to access a server that you see a problem on. Sorry. Can anyone else help? Jason -- Jason Grout --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Update R to the 2.9 release with milestone Sage 4.0
On May 7, 4:24 pm, Mike Hansen mhan...@gmail.com wrote: On Thu, May 7, 2009 at 4:15 PM, mabshoff michael.absh...@mathematik.uni-dortmund.de wrote: Thanks for dong this work so far. Did you ever figure out if libintl was now mandatory? Wasn't it libiconv? Yep, just checked and you are right. But I did not check if 2.9 mandated it. --Mike Cheers, Michael --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Weird(?) behavior of scipy.complex
Hi all. After importing scipy, if I run, say, scipy.complex128(1.0) or even scipy.complex128(1) I get (1+0j) , as I should. However, if I run scipy.complex128(1.0j) , I get this weird error: ---SNIP-- Traceback (most recent call last): File stdin, line 1, in module File /home/cf/.sage/sage_notebook/worksheets/cfantanas/4/code/ 235.py, line 7, in module scipy.complex128(_sage_const_1p0j ) File /home/cf/Code/APD/, line 1, in module File complex_number.pyx, line 879, in sage.rings.complex_number.ComplexNumber.__float__ (sage/rings/ complex_number.c:6201) TypeError: can't convert complex to float; use abs(z) SNIP I am NOT asking it to convert complex to float (at least, I don't think I do). I am running Sage 3.4 on 64-bit SuSE 11.1 with stock kernel 2.6.27.21-0.1, if that matters. TIA for your responses. --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: quotient poly ring and field
TO W. Stein: Thanks. That was what I needed. SAGE is a great piece of software. I'm using it in some adv math and cryptography classes. TO J. Palmieri: Yes I know you can do that. But you get into minor annoyances (which you can code around) such as E.points(). On 5/4/09, William Stein wst...@gmail.com wrote: On Mon, May 4, 2009 at 1:07 PM, gtg yih0siang0l...@gmail.com wrote: Hi I'm new to sage. Can you tell me how to construct finite fields using quotient of poly ring? For instance suppose I want to construct GF(5^2) using a GF(5) poly ring mod out by x^2 + x + 1 how do I do that? I can construct the quotient like this: p = 5 F = GF(p) R.x = F['x'] f = x * x + x + 1 S = R.quotient(f, 'a') How do I force S to a field so that I can use it with elliptic curves? I know that I can simply do GF(5^2) but I want to be able to specify the modulus explicitly. Use the modulus option to GF: sage: p = 5 sage: F = GF(p) sage: R.x = F['x'] sage: S.a = GF(p^2,modulus=x^2+x+1) sage: S Finite Field in a of size 5^2 sage: a^2 + a + 1 0 sage: GF? # get more help! --~--~-~--~~~---~--~~ 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 URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
