Hi Andrew!
On Sep 2, 6:56 pm, andrew ewart aewartma...@googlemail.com wrote:
...
degx= f.degree(z1)
degy= f.degree(z2)
degree=2*degx*degy
...
for q in xrange(0,degree+1):
for ja in range(0,degx):
Can I have a 3d plot graph about a complex funtion in sage?
For example:
f(z)=abs(1/(z-z0))?
I've just tried by the function complex_plot but output is 2d graph!
What command I have to use?
Thanks
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Hi,
I am using CentOS 5.5 x86_86. I've managed to successfully compile
sage-4.5.2.
Now i wish to add netcdf capabilities to sage. So as instructed in the
python version of netcdf -- netCDF4-0.9.1 --- i have installed the
dependencies hdf5, szip and netcdf-4.1.1.
On running sage -python setup.py
want i want to compute is a vector for each power of ad^j that lists all the
coefficients wrt t and y which will have length at most (degree+1)*degx
of course if it is shorter i want to stick 0's on the end until i get to
this length
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so for ad^0 i should get out
[1,0,0,0,0,...,0]
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Hi Andrew!
On Sep 3, 12:28 pm, andrew ewart aewartma...@googlemail.com wrote:
so for ad^0 i should get out
[1,0,0,0,0,...,0]
What you can use is padded_list!
Example:
sage: R.x=QQ[]
sage: p = R.random_element()
sage: p
3/4*x^2 + 1/2*x - 1
sage: p.padded_list(5)
[-1, 1/2, 3/4, 0, 0]
The
finally getting somewhere
now get this output
[1, 0, 0, 0, 0, 0, 0, 0, 0]
[1, 0]
[0, 0]
[0, 0]
[0, 0]
[0, 0]
[0, 0]
[0, 0]
[0, 0]
[0, 0]
[t, 0, t, 0, 2*t, 0, 3*t, 0, 0]
[0, 1]
[0, 0]
[0, 1]
[0, 0]
[0, 2]
[0, 0]
[0, 3]
[0, 0]
[0, 0]
this is very close all i want to do is now join each collection
On Sep 3, 1:42 pm, andrew ewart aewartma...@googlemail.com wrote:
...
this is very close all i want to do is now join each collection of lists
together
so get outputs
[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
and
[0, 1, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 0]
thoughts?
Dear sage support
trying to learn how to use Sage in graph theory. I do not know the
terminology in this area of mathematics. Is the flow and the edge_cut
the two quantities which are equal by ford fulkerson theorem
http://en.wikipedia.org/wiki/Max-flow_min-cut_theorem ?
I consider the following
On 3 zář, 15:54, ma...@mendelu.cz ma...@mendelu.cz wrote:
Dear sage support
trying to learn how to use Sage in graph theory. I do not know the
terminology in this area of mathematics. Is the flow and the edge_cut
the two quantities which are equal by ford fulkerson
This is a matplotlib bug which has nothing to do with sage.
I filed a bug:
https://sourceforge.net/tracker/?func=detailaid=3058804group_id=80706atid=560720
and emailed them:
http://sourceforge.net/mailarchive/message.php?msg_name=AANLkTimVZgO_e6iYvQpcCA4JDaxwjuWLvg-yJSXjW%3DCO%40mail.gmail.com
Yes, complex_plot is similar to a Mathematica function of the same
type.
To plot such a function the way you are indicating, we need to have
the fast_float/fast_callable functions which do (very fast, as the
name indicates) evaluation of functions to be plotted to work with
complex input. This
Thanks Seb. I actually ran the VMWare installation in the end but I'm
sure the guide you wrote below will prove helpful to others that find
themselves similarly confused. Cheers.
On Aug 29, 7:10 am, Seb Taylor pruvit2me...@gmail.com wrote:
hey nick,
i too am a complete newbie to this sage/
Am Freitag, den 03.09.2010, 07:58 -0700 schrieb kcrisman:
Yes, complex_plot is similar to a Mathematica function of the same
type.
To plot such a function the way you are indicating, we need to have
the fast_float/fast_callable functions which do (very fast, as the
name indicates)
Hi, I wonder if there's any 'imply' kind of function in Sage ? For
example
eq1 = x -y == 0
eq2 = x^2 - y^2 == 0
eq1 implies eq2(but not the other way around).
If no then is there any efficient way to do it ?one way I can
think of (that might not work) is get the factor_list of eq1
On Sep 3, 11:56 am, Eckhard Kosin e...@mathematik-service-kosin.de
wrote:
Am Freitag, den 03.09.2010, 07:58 -0700 schrieb kcrisman: Yes, complex_plot
is similar to a Mathematica function of the same
type.
To plot such a function the way you are indicating, we need to have
the
Hi,
I want to make a function for a sum that has two different options for
each term, depending on a condition. E.g.
F(m) = sum(n=1, 10, if( m*n0, m*n+2, m*n+8))
How do I put the else if m*n0 then m*n+8 into the Sage statement:
sum( m*n +2 for n in range(1,10) if m*n0 ) ?
Thank you
Kim
--
One option is:
sage: def F(m):
:return sum([(m*n+2 if m*n 0 else m*n+8) for n in range(1, 10)])
sage: F(2)
162
sage: F(-2)
-72
--Mike
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Hi!
I have a list of computations (in fact, a test suite), and I'd like to
do them in parallel. Of course, I could use @parallel, but:
1) each computation uses 3 processes (Sage, GAP, Singular)
2) it is probably not nice to other users if parallel computation
uses all available CPUs.
I'd
Btw, I observed that converting to undirected graph gives the same
edge_cut, 31. Does edge_cut assume implicitly that the graph is
undirected?
No, it has two behaviours depending on the type of Graph.
I am trying to find out where it comes from, but for the moment I am a
bit stuck O_o
What I
Hello,
For polynomial equations, the following should work in general.
sage: R.x,y = CC['x','y']
sage: f = x-y
sage: g = x^2 - y^2
sage: I = R.ideal([f]).radical()
sage: g in I
True
In general, to see if the equation g == 0 is implied by the equations
f1==0, f2==0, ..., fn==0 you can do
I =
Hi!
I guess I can answer the question about number of cpus myself (google
was my friend, after all...):
import multiprocessing
multiprocessing.cpu_count()
However, I'd appreciate to get an answer to the sage -t question.
Cheers,
Simon
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On Sep 3, 10:47 am, Simon King simon.k...@nuigalway.ie wrote:
Hi!
I have a list of computations (in fact, a test suite), and I'd like to
do them in parallel. Of course, I could use @parallel, but:
1) each computation uses 3 processes (Sage, GAP, Singular)
2) it is probably not nice to
On Fri, Sep 3, 2010 at 12:47 PM, Simon King simon.k...@nuigalway.ie wrote:
Hi!
I have a list of computations (in fact, a test suite), and I'd like to
do them in parallel. Of course, I could use @parallel, but:
1) each computation uses 3 processes (Sage, GAP, Singular)
2) it is probably not
Hi Didier and John!
On 3 Sep., 20:02, didier deshommes dfdes...@gmail.com wrote:
Besides, a while ago I asked how one can execute the sage test script
on a string, *without* saving that string into a file and *without*
forking a sage -t subprocess. Do you see a way?
Sounds like you want
I'll post a followup to this thread when I will have found the
cause :-)
I re-read thirty times the code and even tried to debug the LP solver
themselves. It went easier when I had the smart idea to read what was
written and not what I intended to write. The line :
On Sep 3, 6:56 pm, Jason Bandlow jband...@gmail.com wrote:
For polynomial equations, the following should work in general.
sage: R.x,y = CC['x','y']
sage: f = x-y
sage: g = x^2 - y^2
sage: I = R.ideal([f]).radical()
sage: g in I
True
In general, to see if the equation g == 0 is implied
Hi!
On 3 Sep., 21:37, JamesHDavenport j.h.davenp...@bath.ac.uk wrote:
On Sep 3, 6:56 pm, Jason Bandlow jband...@gmail.com wrote: For polynomial
equations, the following should work in general.
sage: R.x,y = CC['x','y']
sage: f = x-y
sage: g = x^2 - y^2
sage: I = R.ideal([f]).radical()
Here's a slightly different workaround that doesn't require any lambda
expressions:
var('z,z0,x,y')
f=abs(1/(z-z0)).subs({z:x+I*y,z0:1/2+i})
ff = fast_callable(f,vars=[x,y],domain=CDF)
plot3d(ff,(x,-2,2),(y,-2,2))
-Marshall
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On 09/ 3/10 07:00 PM, John H Palmieri wrote:
On Sep 3, 10:47 am, Simon Kingsimon.k...@nuigalway.ie wrote:
I'd like to restrict @parallel(ncpus=...), where ... is something
like 1/2 (or 1/3?) of the available CPUs. But how can I determine
this number?
From sage (or python):
sage:
Hi David!
On 4 Sep., 01:01, Dr. David Kirkby david.kir...@onetel.net wrote:
Be aware, that for hyperthreaded machines, the number of CPUs may exceed the
number of cores.
Ah. I guess that I wanted the number of cores. If, as you say, half
the CPUs is enough to occupy all resources, then I'd
On Sep 3, 11:13 am, Simon King simon.k...@nuigalway.ie wrote:
Probably not. I guess what I am asking is whether the functionality of
the sage-test script is available as a function that can be imported
into sage.
Since up to now no-one seems to be able to answer that question, I'll
speculate.
On Fri, Sep 3, 2010 at 10:47 AM, Simon King simon.k...@nuigalway.ie wrote:
Hi!
I have a list of computations (in fact, a test suite), and I'd like to
do them in parallel. Of course, I could use @parallel, but:
1) each computation uses 3 processes (Sage, GAP, Singular)
2) it is probably not
On 09/ 4/10 12:10 AM, Simon King wrote:
Hi David!
On 4 Sep., 01:01, Dr. David Kirkbydavid.kir...@onetel.net wrote:
Be aware, that for hyperthreaded machines, the number of CPUs may exceed the
number of cores.
Ah. I guess that I wanted the number of cores. If, as you say, half
the CPUs is
Hi David,
On 4 Sep., 01:53, Dr. David Kirkby david.kir...@onetel.net wrote:
Is SAGE_NCPUS used anywhere?
Well, I was not suggesting to introduce an environment variable that
is used anywhere in Sage except to tame my test script. Of course,
if there already is an environment variable that
On Fri, Sep 3, 2010 at 12:47 PM, Simon King simon.k...@nuigalway.ie wrote:
Hi!
I have a list of computations (in fact, a test suite), and I'd like to
do them in parallel. Of course, I could use @parallel, but:
1) each computation uses 3 processes (Sage, GAP, Singular)
2) it is probably not
On Fri, Sep 3, 2010 at 8:01 PM, Simon King simon.k...@nuigalway.ie wrote:
Hi David,
On 4 Sep., 01:53, Dr. David Kirkby david.kir...@onetel.net wrote:
Is SAGE_NCPUS used anywhere?
Well, I was not suggesting to introduce an environment variable that
is used anywhere in Sage except to tame my
I have a rational function P(x)/Q(x) with numerators and denominators
of very large degree. From the context I know that a certain
polynomial p(x) should divide the denominator. If I multiply the
numerator by p(x) giving p(x)*P(x)/Q(x) how do I get sage to cancel
p(x) with the factor in Q(x)? In
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