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) evaluation of functions to be plotted to work with
> complex input. This is largely done, but still needs review and/or
> work.
>
> Obviously one could work around this by doing everything in x and y
> only (without i, even) but this is not a long-term solution. I have
> been frustrated by this not working as well in the past.
>
> Sorry this is not as easily available as it should be.
May I propose a workaround:
sage: var('x,y,z,z0')
(x, y, z, z0)
sage: z0 = 1+i
sage: f(z) = abs(1/(z-z0))
sage: plot3d(lambda x,y: f(x+i*y), (x,0,2), (y,0,2))
I don't know why I can't plot f without the use of lambda:
sage: plot3d(f(x+i*y), (x,0,2), (y,0,2))
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/ecki/<ipython console> in <module>()
... <snip> ...
TypeError: float() argument must be a string or a number
Is this bug?
sage: version()
'Sage Version 4.3.3, Release Date: 2010-02-21'
Regards
Eckhard
>
> - kcrisman
>
> On Sep 3, 5:52 am, sps <[email protected]> wrote:
> > 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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