Hi,
I have recently started using SAGE on sagenb.org and I am very impressed by
it.
I have downloaded the full system and was following the instruction given,
but it didn't work for me.
Precisely, the following problems come -
1. it is unable to execute the binary file
10:38:07 $ ./sage
-
Thanks a lot William.
This was the problem.
> He downloaded the wrong binary for his computer/OS. Maybe he
> downloaded a 64-bit binary for a 32-bit operating system or something.
>
I downloaded the correct binary and its working fine.
Sorry for a question, which should not have been there in f
>
> I should mention that these methods are all nice for this problem, but
> they also end up copying an awful lot of zeros. I think it would be way
> more efficient in general to make a zero matrix, then set the right
> diagonal by hand using a for loop.
>
Don't you think using a sparse matrix w
> Is there any way to get only one plot in one figure?
Yes, use plt.figure().
plt.plot( ... )
plt.savefig('a.png')
plt.figure()
plt.plot( ...)
plt.savefig('b.png') # you can actually give the same name if you are doing
it in different cells
Rajeev
On Fri, May 14, 2010 at 1:29 PM, zetro wrote
here is the answer to the first thing. use auto_update=False -
sage: @interact
... def _(A=matrix(QQ,3,3,range(9)), v=matrix(QQ,3,1,range(3)),
auto_update=False):
... try:
... x = A\v
... html('$$%s %s = %s$$'%(latex(A), latex(x), latex(v)))
... except:
... html('Th
On Sun, May 22, 2011 at 4:45 PM, Berkin Malkoc wrote:
>
>
>
> > I have something like:
>> > y = x^2
>> >
>> > I can evaluate it at one point:
>> > y(2) # 4
>> >
>> > I'd like to evaluate it at a group of points:
>> > y( x ) # 2, 4, 9, 16, ...
>> >
>> > Can this "just work" like in IDL
Hi,
I think my other question got buried in the first one, so here it is again.
If I have -
sage: R. = FreeAlgebra(QQ, 2)
sage: a*(a+b)
a^2 + a*b
Is there a simple way to get a*a instead of a^2 ?
Rajeev
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Thanks Simon,
i think list of lists and tuples are good enough for me.
sage: R. = FreeAlgebra(QQ, 2)
> sage: p = a*(a+2*b)
> sage: list(p)
> [(2, a*b), (1, a^2)]
>
is there a simple way to reverse this last step?
just for information - i asked this same question at the sympy mailing list
and i
On Wed, May 25, 2011 at 11:55 AM, Simon King wrote:
> Hi Rajeev,
>
> On 25 Mai, 06:14, Rajeev Singh wrote:
> > sage: R. = FreeAlgebra(QQ, 2)
> >
> > > sage: p = a*(a+2*b)
> > > sage: list(p)
> > > [(2, a*b), (1, a^2)]
> >
> > is ther
On Thu, May 26, 2011 at 10:26 PM, Mel wrote:
> Do I need to download/load something before I can import the ellipse
> module?
>
> When I type
>from sage.plot.ellipse import Ellipse
> I get "ImportError: No module named ellipse"
>
> Thanks!
>
> --
> To post to this group, send email to sage-su
Hi,
One way using pylab is following -
sage: import pylab as plt
sage: x = plt.array([2^ii for ii in range(10)])
sage: y = x^2
sage: plt.loglog(x, y, '.')
[]
sage: plt.savefig('/home/rajeev/a.png')
Hope it helps.
Rajeev
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To
On Tue, Jun 21, 2011 at 5:37 PM, Dmitry Shkirmanov wrote:
> Hello, i think that my question is simple one, but i have not found
> answer in the reference manual. I need a function of vector variables.
> For example:
> var("x1,x2,x3")
> x=vector([x1,x2,x3])
> Is it possible to define a function of
On Mon, Jul 11, 2011 at 9:43 AM, robin hankin wrote:
> Hi.
>
> When I type
>
> integrate(dirac_delta(x),x,-1,1)
>
>
> I expected to get 1, as the documentation clearly implies.
>
> But instead I get a symbolic answer.
>
> How do I make sage return 1?
>
>
>
>
> cheers
>
> Robin
>
>
> --
> Robin Han
Hi,
I have a script (say a.py) which uses a function written in fortran 90.
Within the script I give the command to compile using -
os.system('f2py -c PD_evolve.f90 -m PD_evolve')
It works fine on my computer if I run the script using -
python a.py
However it doesn't work if I use -
sage -pyt
On Sat, Jul 30, 2011 at 1:42 PM, Rajeev Singh wrote:
> Hi,
>
> I have a script (say a.py) which uses a function written in fortran 90.
> Within the script I give the command to compile using -
>
> os.system('f2py -c PD_evolve.f90 -m PD_evolve')
>
> It work
Hi,
I am not able to understand why the following should not work (in notebook)
-
cell 1 ##
%cython
from sage.all import ode_solver, random
cdef class A:
cdef double mu
def __init__(self, double mu=1.):
self.mu = mu
def func(self, x):
Hi,
If I put the following in notebook, I don't get what is expected, i.e. a
function called linearequations -
fortran.libraries = ['lapack', 'blas']
code = '''!f90
Subroutine LinearEquations(A,b,n)
Integer n
Real*8 A(n,n), b(n)
Integer i, j, pivot(n), ok
call DGESV(n, 1, A, n, pivot, b, n, ok)
On Wed, Aug 10, 2011 at 6:48 PM, Rajeev Singh wrote:
> Hi,
> I was trying out the codes discussed
> at
http://technicaldiscovery.blogspot.com/2011/07/speeding-up-python-again.html
> Here is a summary of my results -
> Computer: Desktopimsc9arav
On Wed, Sep 7, 2011 at 7:31 PM, Chipslinger wrote:
> I've been messing around with using Sage for solving node equations. I
> have the right syntax and structure for creating and symbolically
> solving equations, but am struggling with:
> * Using solve in a loop -- it doesn't evaluate using new
Hi,
The following examples compiles from the notebook
%cython
cimport sage.gsl.ode
import sage.gsl.ode
include 'gsl.pxi'
cdef class van_der_pol(sage.gsl.ode.ode_system):
cdef double beta
def __cinit__(self, double beta=1.0):
self.beta = beta
cdef int c_f(self,double t, double
On Wed, Sep 14, 2011 at 3:01 PM, Rajeev Singh wrote:
> Hi,
>
> The following examples compiles from the notebook
>
> %cython
> cimport sage.gsl.ode
> import sage.gsl.ode
> include 'gsl.pxi'
>
> cdef class van_der_pol(sage.gsl.ode.ode_system):
> cdef
On Thu, Sep 15, 2011 at 12:07 PM, Robert Bradshaw
wrote:
> On Wed, Sep 14, 2011 at 2:31 AM, Rajeev Singh wrote:
>> Hi,
>>
>> The following examples compiles from the notebook
>>
>> %cython
>> cimport sage.gsl.ode
>> import sage.gsl.ode
>
On Thu, Sep 15, 2011 at 6:23 PM, Rajeev Singh wrote:
> On Thu, Sep 15, 2011 at 4:56 PM, Andrew Francis wrote:
>> Hi all,
>>
>> I'm new to this group; thanks for having me.
>>
>> I have generated a large number of text files (several lots of 81
>> fi
On Thu, Sep 15, 2011 at 4:56 PM, Andrew Francis wrote:
> Hi all,
>
> I'm new to this group; thanks for having me.
>
> I have generated a large number of text files (several lots of 81
> files) with the intention of reading them back into another sage
> program (via the command line). The text fil
On Thu, Sep 15, 2011 at 7:10 PM, kcrisman wrote:
>
>
> On Sep 15, 9:08 am, Dan Drake wrote:
>> This is strange:
>>
>> x, y =var('x y')
>> plot3d(sqrt(x^2+y^2)*sin(1/sqrt(x^2+y^2)), (x,-1/2, 1/2), (y, -1/2, 1/2),
>> adaptive=True)
>>
>> fails with "ValueError: cannot convert float NaN to integer"
On Thu, Sep 15, 2011 at 3:24 PM, Rajeev Singh wrote:
> On Thu, Sep 15, 2011 at 12:07 PM, Robert Bradshaw
> wrote:
>> On Wed, Sep 14, 2011 at 2:31 AM, Rajeev Singh wrote:
>>> Hi,
>>>
>>> The following examples compiles from the notebook
>>>
On Sat, Sep 17, 2011 at 5:46 PM, Santanu Sarkar
wrote:
> Hi all,
>
> I want to use cython.
>
> The following code does not work
> %cython
> cdef P
> P = next_prime(ZZ.random_element(2^(100-1),2^100))
>
>
> --
> To post to this group, send email to sage-support@googlegroups.com
> To unsubscribe fro
On Wed, Nov 2, 2011 at 12:08 PM, Laurent wrote:
> In order to anticipate the next question, if you are wotking in a script
> instead of
> the terminal.
>
> The code
>
> f(x,y)=x*y
> print f(5,4)
>
> raises
> SyntaxError: can't assign to function call
>
>
> The code
> x,y=var('
Hi,
I am getting the following error when I try to compile sage-4.8 from source -
UNKNOWN COMPILER 'gcc-4.3' for ICC: you must also supply flags!
make[3]: *** [atlas_run] Error 1
I am on an amd64 machine running debian. If more details are needed I
can attach the log file. Thanks in advance for
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