On 5/20/07, jperry <[EMAIL PROTECTED]> wrote:
>
> I guess I solved my own problem:
>
> show( eval( maxima.eval( "sin(x)" ) ).plot( x, -5, 5 ) )
>
> On May 20, 2:14 pm, jperry <[EMAIL PROTECTED]> wrote:
> > What's the proper method to plot a Maxima function? Maybe I'm
> > misunderstanding the syntax, but something like:
> >
> > show( maxima("x*sin(x)").plot( x,-5,5 ) )
> >
> > gives me a graph consisting of axes with "x*sin(x)" printed in the
> > center of the graph (no plot).
> >
> > Using plot2d() works, but I'd prefer not to use Gnuplot since I'm
> > using the web-based notebook and my browser can't display EPS files.
> >
> > I can also use something like:
> >
> > L = [(x, maxima.eval( "float(sin(%s))"%x )) for x in range(-5,5)]
> > show( line(L) )
> >
> > Is there a simplier way? AFAIK I can't avoid using Maxima because I'm
> > using some ODE/Laplace functions that don't exist natively.
Unfortunately, in your follow up post you didn't fix your problem,
since you just
ended up plotting sage's sin function.
But using a strategy like you are using above, e.g.,
show ( plot( lambda x: float(maxima('sin(%s)'%x)), 0, 10 ) )
is probably a good way to go. NOTE -- it *will* be slow, since there
is a separate call to maxima to evaluate every single point
of the plot -- this might not be a problem for your application, though.
So you might want to restrict the number of evaluation points, e.g.,
show ( plot( lambda x: float(maxima('sin(%s)'%x)), 0, 10 ,
plot_points=10, plot_division=0) )
Note that as of sage-2.5, we have much much better support for
symbolic calculus type stuff directly in SAGE without having to use
maxima at all. You might want to try it out. E.g.,
We compute a few Laplace transforms:
sage: sin(x).laplace(x, s)
1/(s^2 + 1)
sage: (z + exp(x)).laplace(x, s)
z/s + 1/(s - 1)
sage: var('t0')
t0
sage: log(t/t0).laplace(t, s)
(-log(t0) - log(s) - euler_gamma)/s
See http://sagemath.org/doc/html/ref/module-sage.calculus.calculus.html
and the sections around that section.
.... And it's so cool that you -- my office mate from Northern Arizona
University
in 1994 -- are using SAGE!
William
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