n using machine precision arithmetic (be it via
Cython or NumPy), is there a way to tell whether at some point throughout a
long computation there were numerical overflows - without paying a huge
speed penalty for making this check?
Thanks,
Felix
On Wednesday, November 20, 2013 8:00:41 PM UTC+1, Nil
y big
integers are very few and far between, but they do exist?
Thanks,
Felix
On Wednesday, November 20, 2013 7:27:11 PM UTC+1, Felix Breuer wrote:
>
> Hi Simon, hi Maarten,
>
> thank you for your answers!
>
> @Simon:
>
> Yes, I figured that calling vector(...) would imp
this fits to Cython's types?
Cheers,
Felix
On Wednesday, November 20, 2013 7:10:06 PM UTC+1, Maarten Derickx wrote:
>
> It seems like your code is mostly doing easy integer operations in tight
> for loops (although in your case the for loop is hidden in v.apply_map). If
> you car
apply_map). (Do something like return vector((foo(vi,d) for vi in v)) instead
of apply_map does not make much a difference.)
Now, my questions are:
1) Why is this so slow? Am I missing something here?
2) Is there anything I can do to improve performance?
Thank you very much,
Felix
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You
With "backend='ppl', base_ring=QQ" it works!
Thanks again ;)
Am Dienstag, 23. April 2013 14:10:26 UTC+2 schrieb Volker Braun:
>
> This is now http://trac.sagemath.org/14479 (needs review)
>
>
>
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T
Hi,
while trying to render the intersection of a 4-cube and a 3-cube (I guess
that really doesn't matter), I stopped on trouble with the following:
sage: point_list = [[0.132, -1.028, 0.028],[0.5, 0.5, -1.5],[-0.5, 1.5,
-0.5],[0.5, 0.5, 0.5],[1.5, -0.5, -0.5],[-0.332, -0.332, -0.668],[-1.332,
I'd be happy to do some more work on it. I would need some pointers,
though, on what still needs to be done. I can write up some documentation
next week.
Cheers,
Felix
PS: I am at the Joint Meetings right now. Are you at JMM? Or are there any
Sage-related events at JMM?
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re of first :)
Cheers,
Felix
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help!
Felix
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Hi John!
Thanks for your detailed answer! I will try to figure this out and get back
to you!
Felix
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d to have?
Sorry, if these questions are somewhat fuzzy, but I am new to sage. Thank
you for any help you can give!
Best,
Felix
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F
On May 3, 1:00 pm, Jason Grout wrote:
> At one point, some people were experimenting also with using GPU to
> speed up linear algebra, but I don't think any code made it into Sage.
There are trac tickets for this at #10009 and #10010 for OpenCL and
CUDA respectively. They use Andreas Kloeckner's
ignoring the I. Not as
convenient as it could be, but at least it doesn't give you an
incorrect answer!
Cheers,
Felix
On Nov 4, 11:57 pm, kcrisman wrote:
> On Nov 3, 10:41 pm, Felix Lawrence wrote:
>
> > Here's why there's a discrepancy:
> > sage: import
nverters, and you send it this one:
lambda s: complex(s.replace('i','j'))
Does anyone know if this is fixed in newer versions of numpy/scipy?
Cheers,
Felix
On Nov 3, 2:43 am, kcrisman wrote:
> Dear support,
>
> We get some inconsistencies with using I and j in sc
else to review the patch before it gets included in a new version of
sage.
Cheers,
Felix
On Jun 1, 11:45 pm, Chris Kees wrote:
> Hi,
>
> I'm trying to build a fortran extension module with f2py using and spkg I've
> built for sage 4.4.2 on Mac OS X 10.6. When I just run &
Hi,
you could also check out reduce[1] with the redten[2] package, which
worked very well and fast(!) for me, not comparable to the Maple tensor
package.
Regards,
Felix
[1] http://www.reduce-algebra.com/
[2] http://www.utsc.utoronto.ca/~harper/redten.html
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>0)
sage: g = integrate(t^(x-1)*exp(-t),(t,0,infinity))
sage: g(3).n()
---
TypeError Traceback (most recent call last)
/home/felix/ in ()
/home/felix/Temp/sage-4.3/local/lib/python2.6/site-packages/sage/symbolic/expression.so
in sa
It turned out that there was another bug in there. At least on my
machine, f2py was still broken on 4.3.1.rc1. I tracked down the
problem (mac gcc doesn't support -shared) and there's a patch ready
for review at ticket #8010.
Cheers,
Felix
On Jan 15, 10:42 am, gsw wrote:
> >
more sensible not to display these omnipresent
identifiers? It's hard to find my own variables in the mess!
(I'm on 10.6, core 2 duo, running 4.3, if this is a bug)
Cheers,
Felix
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t 1)), it
gives me a much longer error message, which I have posted at
http://www.physics.usyd.edu.au/~felix/sage/sage_fortran_error.txt
Is there a way to get sage to prefer /usr/bin/gcc to /usr/local/bin/
gcc that is easier than temporarily editing my path globally? Does
sage's fortran normally work on mac
ugh space for the next command
as well.
What can I do about this?
Thank you very much for your help!
Felix
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Hello,
When I try:
var('t')
r=vector((t^2,5*t,t^2-16))
v=derivative(r(t),t)
norm_v=v.norm()
print r
print v
pos=r(0)
print pos
vel=v(0)
i receive an error for the last command vel(0)...i suppose i'm doing
something wrong
see error below
Thank you for help...
FG
Traceback (most recent ca
Sage. However barvinok has not
been packaged yet and I could not find out whether other such
software, e.g. LattE, has already been included in Sage.
Thanks,
Felix
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sage-support+uns
],[c2])')
M = maxima('matrix(a-c,b-c)')
M = maxima('matrix(transpose(a-c),transpose(b-c))')
In the last two lines I get errors about the arguments being "invalid
rows".
Any suggestions?
Thanks,
Felix
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Hi,
just came back to check for any progress in this thread. Tried your
patch and it seems to work fine for me.
Thanks a lot,
Felix
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different host. Correct?
Thanks,
Felix
On 11 Okt., 21:20, William Stein wrote:
> On Sun, Oct 11, 2009 at 12:03 PM, Felix Breuer wrote:
>
> > Hello!
>
> > I am trying to run the VMWare image of Sage 4.1.1. I downloaded and
> > unzipped the image and ran it with the vmw
ce is that running notebook does
not give any error message, it just returns to the prompt immediately.
Any suggestions?
Thanks,
Felix
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Hi,
I just got a trac account and create the ticket at
http://trac.sagemath.org/sage_trac/ticket/6914 .
By the Way: I verified, that the problem is also present with the 32
bit mac intel binary.
- Felix
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Actually, the code from your last post works perfectly under sage
4.0.1 (OSX intel).
[39mcreating
/var/folders/hF/hFYXAHyRF680EWYF08TbAE+++TI/-Tmp-/felix/
python25_interme\
diate/compiler_56e514baa7dba73b5ded18f9a64c0373 [0m
Time: CPU 0.29 s, Wall: 6.09 s
179997
Time: CPU 0.01 s, Wall: 0.01
Hi,
What about:
import scipy.weave
from scipy.weave import converters
?
- Felix
On 4 Sep., 21:56, Patrick Hammer wrote:
> Hi!
>
> import weave
> from weave import converters
>
> gives:
>
> Traceback (most recent call last):
> File "", line 1, in
>
g to sage 4.0.1 when I intend to use weave (I
only use it to test code fragments before I build proper extensions)
which is currently good enough for me to get my work done.
- Felix
On 25 Aug., 09:09, Robert Bradshaw
wrote:
> I wonder if this broke in the upgrade to 2.6. The errors below mean
r Mac
OS X 10.5.8 on my MacBook Pro Unibody rev. A. It used to work fine
before.
Weave doesn't even try to compile anything anymore it just produces a
KeyError:
>>> from scipy import weave
>>> weave.inline("""printf("hello");""")
Hello,
I have a system of 5 equations:
x=2*a+1
x=3*b+2
x=4*c+3
x=5*d+4
x=6*e+5
a,b,c,d,e,x are integers variables.
I would solve the system with solve().
1)How to declare that solve have to assume x,a,b,c,d,e as integers?
The answer is k*60+59 k integer.
Can Sage with the solve function r
Hello,
A very simple question:
I need to resolve a system of equations with the solve(..) function.
How to declare that :
1) the variables belong to N (positives integers )
2) filter the answers of the resolved system to N.
Thank you.
Felix
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