kcrisman wrote:
> The new variables don't seem to work well with the plotting code as
> is; I give below output for two plots using old and new variables. I
> assume this is known, but just wanted to put it out there.
>
> On the plus side, the new variables are MUCH faster. How do I know?
> Because for the first time ever using Sage, I don't have to wait for a
> variable! It is also nice to not see that "Exiting spawned Maxima
> process." message. So thank you to Burcin and the rest involved in
> this.
>
> - kcrisman
>
> Examples:
>
> Using old variables in 3.2.alpha0 works fine:
> sage: var('x,y,z')
> (x, y, z)
> sage: plot(x^2,0,1) [works]
> sage: plot(x^2,x,0,1) [works]
>
> Using new variables in same version, not so good:
> sage: var('x,y,z', ns=1)
> (x, y, z)
> sage: (x+y).variables()
> [x, y] # proves we have the new variables
> sage: plot(x^2,0,1)
> verbose 0 (3605: plot.py, _plot) WARNING: When plotting, failed to
> evaluate function at 400 points.
> verbose 0 (3605: plot.py, _plot) Last error message:
> ''sage.symbolic.expression.Expression' object is not callable'
> sage: plot(x^2,x,0,1)
> verbose 0 (3400: plot.py, plot) there were 3 extra arguments (besides
> x^2)
FYI, this is just because the new symbolic expressions are not callable:
sage: expr=x^2
sage: expr(1)
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
/home/jason/<ipython console> in <module>()
TypeError: 'sage.symbolic.expression.Expression' object is not callable
If you wrap it in a python function, for now, you can get the
functionality you want:
sage: expr=x^2
sage: def f(x):
....: return expr.subs(x=x)
....:
sage: plot(f,0,1)
But I'm sure it'll be taken care of soon anyway.
Jason
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