The following program runs really, really slowly. Is there anyway to
speed this up. I tried it as a .spyx program, put it wouldn't compile:
It takes my machine around 10 seconds. I suppose it is the symbolic math?
f(x,y) = y^2*abs(3*exp(2*pi*i*(x+i*y))*3*exp(4*2*pi*i*(x+i*y)) +
8*exp(2*pi*i*(x+i*y))*10*exp(4*2*pi*i*(x+i*y)))
maxY = 5
M=10
d = 0.1
supNorm = 0
for N in range(0,M):
for K in range (0, M*(int(maxY-1/2)+1) ):
a = -0.5 + N*d
b = 0.5 + K*d
if f(a,b) > supNorm:
supNorm = f(a,b)
print N
print supNorm
On Wed, Nov 25, 2009 at 12:08 PM, <sage-support@googlegroups.com> wrote:
> Today's Topic Summary
>
> Group: http://groups.google.com/group/sage-support/topics
>
> Is it possible to do a binary upgrade similar to sage -upgrade? [2 Updates]
> how to scroll down more when doing ?? for long listing? [4 Updates]
> Short question about saving the source of a Sage notebook [3 Updates]
> Can't run Cython's hello world example [1 Update]
> Shortcut for going down a cell [1 Update]
> symbolic linear algebra: beginner questions [2 Updates]
>
> Topic: Is it possible to do a binary upgrade similar to sage -upgrade?
>
> "Carlos Córdoba" <ccordob...@gmail.com> Nov 25 09:21AM -0500
>
> Thanks for the tip Mike. I'll investigate this approach and report progress,
> if I make some.
>
> Carlos
>
> 2009/11/24 Mike Hansen <mhan...@gmail.com>
>
>
>
>
> Harald Schilly <harald.schi...@gmail.com> Nov 25 07:32AM -0800
>
>> zsync
>
> FWIW, I implemented zsync and it isn't good. It's probably the same
> underlying issue as with rsync, where too many small connections try
> to fetch small files but overall it takes much longer and the whole
> traffic might be even worse. zsync issued warnings about block sizes,
> i reduced their size and the zsync files got bigger than 20 mb.
> Therefore I'll remove zsync from the mirror network.
>
> H
>
>
>
> Topic: how to scroll down more when doing ?? for long listing?
>
> Nasser Abbasi <n...@12000.org> Nov 24 05:27PM -0800
>
> hi;
>
> I have 2 questions below:
>
> I created an account on sagenb.org, and when I do
>
> solve??
>
> I get the listing, but it does not list the whole code, and there is
> no way for me to look below what is shown on the screen (there is no
> scroll bar for use to scroll down more). My browser ofcourse has
> scroll down bar, but not for the listing itself.
>
> Is this a feature of the server or a bug?
>
> I also find it strange that I could not use wild card for searching, I
> keep forgetting name of commands. It would nice if one in sage can
> write
>
> *solve*?
>
> No object '' currently defined.
>
> to get listing of all functions in which the word 'solv' is in its
> name, as I can do in Mathematica:
>
> *solve*?
>
> System`
> DSolve LinearSolveFunction NSolve SolveAlways
> FrobeniusSolve MainSolve RSolve SolveDelayed
> LinearSolve NDSolve Solve
>
> AbstractAlgebra`Master`
> RingSolve
>
>
> May be this can be added for a future release as it is really useful
> to have.
>
> --Nasser
>
>
>
> Marshall Hampton <hampto...@gmail.com> Nov 24 05:38PM -0800
>
> What browser are you using? The browser scroll bar works fine for me
> with long ?? entries.
>
> As a temporary workaround, to get the code of an object foo you could
> do something like:
>
> print open(foo.__code__.co_filename).read()
>
> -Marshall Hampton
>
>
>
>
> Nasser Abbasi <n...@12000.org> Nov 24 06:07PM -0800
>
> On the scroll part: I think it is my error.
>
> My eyes are trained to look for closing end if and some sort of end of
> function indicator. So I assumed there is more code to follow since I
> saw an 'if' and no closing for the 'if'
>
> After I posted this, I realized that the listing is all there is, and
> this is, like, pyhton, duh, and it has no end if, and end def, but
> uses indentation to indicate the structure of the code.
>
> silly me.
>
> I find it nice that one can list the source code.
> --Nasser
>
>
>
>
> Simon King <simon.k...@nuigalway.ie> Nov 25 03:53AM -0800
>
> Hi Nasser!
>
>>
>> *solve*?
>
> I agree that this would be nice.
>
> However, the commands search_def, search_doc and search_src might
> help.
>
> For example,
> sage: search_def('solve')
> yields
> matrix/matrix_modn_sparse.pyx:860: def
> _solve_right_nonsingular_square(self, B, algorithm=None, check_rank =
> True):
> matrix/matrix2.pyx:84: def solve_left(self, B, check=True):
> matrix/matrix2.pyx:125: def solve_right(self, B, check=True):
> matrix/matrix2.pyx:304: def _solve_right_nonsingular_square(self,
> B, check_rank=True):
> matrix/matrix2.pyx:371: def _solve_right_general(self, B,
> check=True):
> matrix/matrix_integer_dense_hnf.py:297:def
> solve_system_with_difficult_last_row(B, a):
> matrix/matrix_integer_dense_saturation.py:104:def
> solve_system_with_difficult_last_row(B, A):
> matrix/matrix_double_dense.pyx:764: def solve_left_LU(self, b):
> matrix/matrix_double_dense.pyx:820: def solve_left(self,vec):
> matrix/matrix_integer_dense.pyx:3514: def
> _solve_right_nonsingular_square(self, B, check_rank=True):
> ...
> (a total of 39 lines)
>
> Kind regards,
> Simon
>
>
>
> Topic: Short question about saving the source of a Sage notebook
>
> Minh Nguyen <nguyenmi...@gmail.com> Nov 25 01:06PM +1100
>
> Hi folks,
>
> I received the following question about the notebook, but I have no
> idea how to answer the question. I don't use the notebook on a
> regularly basis. I thought someone on this list could help out.
>
> --
> Regards
> Minh Van Nguyen
>
> On Wed, Nov 25, 2009 at 4:01 AM, Bernhard Esslinger
>
>
>
> Dan Drake <dr...@kaist.edu> Nov 25 12:06PM +0900
>
>> My question is: Is there an easy way to move *.PY files instead of *.SWS
>> files, as the SWS file are very big?
>
> SWS files are just bzip'ed tar files. You can do
>
> $ tar jtf foo.sws
>
> to see the files inside a worksheet. If the .sws file is very big, it's
> probably because there are lots of snapshots stored in it, so you could
> extract the files, delete all the snapshot files, and then recompress
> it. The actual code of the worksheet is in the file worksheet.txt.
>
> Dan
>
> --
> --- Dan Drake
> ----- http://mathsci.kaist.ac.kr/~drake
> -------
>
>
>
> William Stein <wst...@gmail.com> Nov 24 07:10PM -0800
>
>> extract the files, delete all the snapshot files, and then recompress
>> it. The actual code of the worksheet is in the file worksheet.txt.
>
>
> (1) in sage >= 4.2 snapshots are never saved in worksheet files. I
> think they might be saved in older version.
>
> (2) the file is named worksheet.html now, instead of worksheet.txt
> (like it used to be).
>
> William
>
>
>
> Topic: Can't run Cython's hello world example
>
> "Jorge E. ´Sanchez Sanchez" <hnr...@hotmail.com> Nov 24 12:43PM -0600
>
> Robert:
>
> That was it!!!
>
> I've just added the flags recommended here (after making the test with
> distutils.sysconfig) and finally I got hw working.
>
> Best regards,
> Jorge
>
>> For more options, visit this group at
>> http://groups.google.com/group/sage-support
>> URL: http://www.sagemath.org
>
> _________________________________________________________________
> Otto te muestra IE8
> www.otto.com.mx
>
>
>
> Topic: Shortcut for going down a cell
>
> cool-RR <cool...@cool-rr.com> Nov 24 07:36PM +0200
>
> Do these issues go anywhere? Does someone write it in an issue tracker or
> should I?
>
>
> --
> Sincerely,
> Ram Rachum
>
>
>
> Topic: symbolic linear algebra: beginner questions
>
> William Stein <wst...@gmail.com> Nov 24 09:27AM -0800
>
>>
>> Any suggestions?
>
> Use Sage. Don't use Maxima.
>
> var('a1,a2,b1,b2,c1,c2')
> a = matrix([[a1],[a2]])
> b = matrix([[b1],[b2]])
> c = matrix([[c1],[c2]])
> M = (a-c).stack(b-c)
> N = transpose(a-c).stack(transpose(b-c))
>
> or
>
> R.<a1,a2,b1,b2,c1,c2> = QQ[]
> a = matrix([[a1],[a2]])
> b = matrix([[b1],[b2]])
> c = matrix([[c1],[c2]])
> M = (a-c).stack(b-c)
> N = transpose(a-c).stack(transpose(b-c))
>
> See
>
> http://sagenb.org/home/pub/1123/
>
> William
>
>
>
> William Stein <wst...@gmail.com> Nov 24 09:28AM -0800
>
>>
>> Use Sage. Don't use Maxima.
>
> Oh, but just for the record, Sage may use Maxima automatically in the
> background for some operations, when you do what I suggested.
>
>
>
> --
> William Stein
> Associate 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
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> For more options, visit this group at
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> URL: http://www.sagemath.org
--
Joshua Friedman PhD
crownea...@gmail.com
http://www.math.sunysb.edu/~joshua
--
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