On 11 Bře, 09:32, jason-s...@creativetrax.com wrote:
> I'm not sure how hard it would be to add one; it would involve figuring
> out how to clip triangles, separate a 3d plot into separate pieces,
> etc., I think.
>
Still thinking on this problem. Trying to plot a function which is
allmost equal to x^2+y^2 in some region and undefined outside this
region
splot x**2+y**2-0.001*sqrt(20-(x-1)**2-(y-2)**2)
in gnuplot I get the plot only above the circle.
Trying to do something similar in sage I got the following
1. ---------------------------------
plot3d(x^2+y^2+0.0000001*sqrt(x-y^2),(x,-4,4),(y,-4,4))
Traceback (click to the left for traceback)
...
ValueError: array must not contain infs or NaNs
2. ---------------------------------------
plot3d(x^2+y^2+0.0000001*sqrt(x-y^2),(x,-4,4),(y,-4,4))
Traceback (click to the left for traceback)
...
ValueError: array must not contain infs or NaNs
3. ---------------------------------------------
plot3d(x^2+y^2+0.0000001*sqrt(x*y),(x,-4,4),(y,-4,4))
this works, plots the function for x*y>0
I do not understand the difference between the last two problems, they
look similar but the results are very different.
and for example the command
plot3d(x^2+y^2+0.0000001*sqrt(-x+y^2),(x,-4,4),(y,-4,4))
works - plots only the part which is outside the parabola (with
strange bounding box, however ....)
Is this a way how to solve the problems of this kind?
Robert
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