Suppose I form the row matrix: M = [ (p_1*p_2, .., p_i*p_j) ] and then
try looking for a column vector x satifying M*x = q where the elements
of x are integers, hopefully 1 or -1. If I tried this approach how
would I get sage to only consider integer vectors x as solutions.
On Sep 8, 6:20 am,
On Sep 8, 6:19 pm, KvS keesvansch...@gmail.com wrote:
Dear all,
I am trying to implement a recursive algorithm that is rather complex,
in the sense that it uses a high number of variables and (elementary)
computations. The output in Sage looks fine but it gets quite slow, so
I am thinking of
I created a Ticket on Sage's Trac:
http://trac.sagemath.org/sage_trac/ticket/9880
It could be a problem with the comparison function
expair_rest_is_less used by std::sort function like in the
following link:
http://gcc.gnu.org/ml/gcc-bugs/2010-08/msg01163.html
The backtrace of our bug look
Hi
Mathematica is touring South Africa.
http://www.wolfram.com/events/southafrica2010/
I expect their presentation to be very professional.
Reviving an old topic since Mathematica is visiting our Free Software supporting
institute www.aims.ac.za on Monday. It happens to be the first day of a
Hi Jan,
On Thu, Sep 9, 2010 at 7:47 PM, Jan Groenewald j...@aims.ac.za wrote:
Does anyone have anything to add,
Here's a section from the Sage FAQ that raises some ethical issues in
mathematics research:
http://www.sagemath.org/doc/faq/faq-general.html#why-is-sage-free-open-source
--
Regards
On 09/08/2010 11:32 AM, HMark wrote:
I'm following up to see if someone has any ideas/suggestions for how
to create a GUI in the notebook and interact with it in a bi-
directional way, where Python code (with the help of Javascript?) can
not only read the GUI controls, but also impact/write
no it should be chekcing the term with the highest power of x and then
make it monic
that includes possibilitys like x*y as this is not monic wrt x
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On 09/ 9/10 10:47 AM, Jan Groenewald wrote:
* the price of the software
http://www.wolfram.com/events/southafrica2010/
$139.95 even for students. I'm not sure I can convey
how astronomical that amount to almost all African
students. Worse, when they want to start a small
business after
On Sep 9, 7:23 am, Dr. David Kirkby david.kir...@onetel.net wrote:
On 09/ 9/10 10:47 AM, Jan Groenewald wrote:
* the price of the software
http://www.wolfram.com/events/southafrica2010/
$139.95 even for students. I'm not sure I can convey
how astronomical that amount to almost all
On 9/9/10 6:23 AM, Dr. David Kirkby wrote:
On 09/ 9/10 10:47 AM, Jan Groenewald wrote:
* the price of the software
http://www.wolfram.com/events/southafrica2010/
$139.95 even for students. I'm not sure I can convey
how astronomical that amount to almost all African
students.
Can you put it
On 9 September 2010 14:43, Jason Grout jason-s...@creativetrax.com wrote:
On 9/9/10 6:23 AM, Dr. David Kirkby wrote:
On 09/ 9/10 10:47 AM, Jan Groenewald wrote:
* the price of the software
http://www.wolfram.com/events/southafrica2010/
$139.95 even for students. I'm not sure I can convey
Hi
On 09/ 9/10 10:47 AM, Jan Groenewald wrote:
* the price of the software
http://www.wolfram.com/events/southafrica2010/
$139.95 even for students. I'm not sure I can convey
how astronomical that amount to almost all African
students.
On Thu, Sep 09, 2010 at 08:43:41AM -0500, Jason Grout
I might shy away from any personal attacks on Stephen Wolfram, despite
controversy as him as a scientist. This should be about comparing sage
and Mathematica, not the people behind them.
One thing that is a natural advantage for me is the ability to not
only use all the packages included in sage,
On Sep 9, 11:41 am, Ben Edwards bjedwa...@gmail.com wrote:
I might shy away from any personal attacks on Stephen Wolfram, despite
controversy as him as a scientist. This should be about comparing sage
and Mathematica, not the people behind them.
The name of the company is Wolfram as well,
kcrisman,
No confusion, the poster included this article:
* the controversial Mr Wolfram as a scientific role model
http://chem.tufts.edu/science/Shermer/E-Skeptic/SkepticsOnWolfram.html
I would say rather than include any discussion about how Dr. Wolfram
practices science, steer the
On 9/9/10 10:54 AM, kcrisman wrote:
On Sep 9, 11:41 am, Ben Edwardsbjedwa...@gmail.com wrote:
I might shy away from any personal attacks on Stephen Wolfram, despite
controversy as him as a scientist. This should be about comparing sage
and Mathematica, not the people behind them.
The name
On Wed, Sep 8, 2010 at 6:39 PM, KvS keesvansch...@gmail.com wrote:
Thanks all, however I am not very successful so far :(.
I tried both options mentioned before:
- only optimize the loops in Cython and keep using symbolic
expressions/infinite precision, but this is unfortunately rather
On 9/9/10 11:27 AM, Robert Bradshaw wrote:
This should be much faster than symbolic (if I
understand you right, calling find_root and integrate) but have higher
precision than using raw doubles.
I believe the standard find_root uses scipy, which is limited to double
precision.
Jason
--
To
On Thu, Sep 9, 2010 at 9:46 AM, Jason Grout jason-s...@creativetrax.com wrote:
On 9/9/10 11:27 AM, Robert Bradshaw wrote:
This should be much faster than symbolic (if I
understand you right, calling find_root and integrate) but have higher
precision than using raw doubles.
I believe the
On Sep 9, 5:27 pm, Robert Bradshaw rober...@math.washington.edu
wrote:
On Wed, Sep 8, 2010 at 6:39 PM, KvS keesvansch...@gmail.com wrote:
Thanks all, however I am not very successful so far :(.
I tried both options mentioned before:
- only optimize the loops in Cython and keep using
On Sep 9, 5:27 pm, Robert Bradshaw rober...@math.washington.edu
wrote:
On Wed, Sep 8, 2010 at 6:39 PM, KvS keesvansch...@gmail.com wrote:
Thanks all, however I am not very successful so far :(.
I tried both options mentioned before:
- only optimize the loops in Cython and keep using
Hi All
I've been solving the following optimisation problem in sage and was
wondering if there's a more efficient method than my current one.
I have a large matrix A and want to solve xA=B, where we can assume
B=(1,0,0,0,...). The matrix has quite large nullity and I want the
solution
On Thu, Sep 9, 2010 at 11:44 AM, KvS keesvansch...@gmail.com wrote:
On Sep 9, 5:27 pm, Robert Bradshaw rober...@math.washington.edu
wrote:
On Wed, Sep 8, 2010 at 6:39 PM, KvS keesvansch...@gmail.com wrote:
Thanks all, however I am not very successful so far :(.
I tried both options
On Sep 9, 4:08 am, andrew ewart aewartma...@googlemail.com wrote:
no it should be chekcing the term with the highest power of x and then
make it monic
that includes possibilitys like x*y as this is not monic wrt x
If I understand your description correctly, that is what the code
does. Compare
On Sep 8, 7:25 pm, Rolandb rola...@planet.nl wrote:
Version 4.5.3 has the same problem. Could you elucidate somewhat more
on what you did exactly.
Where did you put the command sudo rm /etc/udev/rules.d/70-
persistent-net.rules ?
N.B.: I'm using VMware 3.1.1, and I have no knowledge
On 09/ 9/10 04:41 PM, Ben Edwards wrote:
I might shy away from any personal attacks on Stephen Wolfram, despite
controversy as him as a scientist. This should be about comparing sage
and Mathematica, not the people behind them.
I think that would be *very* wise.
I'm no fan of Steven Wolfram.
Dave, I think the key point is that there are clearly companies and
organizations that use python for engineering. Using Sage as a
student gives you exposure to python. I'm sure its technically
possible to use python within mathematica, but its not something you'd
naturally do. So I do think
On 9/9/10 4:53 PM, Marshall Hampton wrote:
I think the key point is that there are clearly companies and
organizations that use python for engineering.
See http://www.python.org/about/success/ for lots of examples.
Jason
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To post to this group, send email to sage-support@googlegroups.com
On Sep 9, 9:17 pm, Robert Bradshaw rober...@math.washington.edu
wrote:
On Thu, Sep 9, 2010 at 11:44 AM, KvS keesvansch...@gmail.com wrote:
On Sep 9, 5:27 pm, Robert Bradshaw rober...@math.washington.edu
wrote:
On Wed, Sep 8, 2010 at 6:39 PM, KvS keesvansch...@gmail.com wrote:
Thanks all,
I doubt it's as extensive as the Python libraries, but then a lot of the
python
libraries are not related to science/engineering/maths.
I agree with this, but I think it's a strength. Part of my research
includes scraping BGP data, and there are modules for doing this in
python.(Currently by
if i have a function f(x,y)
i want to write a function is_irri(f) that would say if f is
irreduible or not
how do i go about this
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sage-support+unsubscr...@googlegroups.com
For
On Thu, 09 Sep 2010 at 11:47AM +0200, Jan Groenewald wrote:
Mathematica is touring South Africa.
http://www.wolfram.com/events/southafrica2010/
I expect their presentation to be very professional.
Reviving an old topic since Mathematica is visiting our Free Software
supporting institute
I completely agree - very well said, except that you don't actually
_need_ an internet connection to use Sage. And in fact South Africa
had rather low bandwidth when I was there (hopefully that's improved
with some new cables) but Jan's lab was running Sage beautifully.
-Marshall
On Sep 9, 6:42
re. decorators, I found this example quite illustrative
def memoize(f):
#this is a decorator eg.
cache = {}
def helper(x):
#lexical closure fn.
if x not in cache:
cache[x] = f(x)
return cache[x]
return helper
#fib = memoize(fib)
# =
@memoize
On Thu, 09 Sep 2010 at 06:00PM -0700, Marshall Hampton wrote:
I completely agree - very well said, except that you don't actually
_need_ an internet connection to use Sage.
Well, unless you travel to the UW and plug in your USB stick into
sage.math and copy a tarball over, someone will be be
On 9 sep, 22:54, jockothy jgmcc...@gmail.com wrote:
On Sep 8, 7:25 pm, Rolandb rola...@planet.nl wrote:
Version 4.5.3 has the same problem. Could you elucidate somewhat more
on what you did exactly.
Where did you put the command sudo rm /etc/udev/rules.d/70-
persistent-net.rules
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