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Get a 3d plot with points (no surface) from a parametric_plot3d?

asked 2014-02-06 03:31:16 +0200

openscript gravatar image

updated 2015-10-20 21:39:13 +0200

FrédéricC gravatar image

I would like to plot only points in a defined resolution, which I get from a parametric_plot3d().

Here is my Sage code:

def x(u,v):
    if u < 100:
        return 7*sin((u/100)*pi)^2+0.15*sin((3*u/10)*pi)
        return a(u,v)
def y(u,v):
    if u < 100:
        return 8*cos((u/100)*pi)+0.15*cos((3*u/10)*pi)
        return b(u,v)
def z(u,v):
    if u < 100:
        return 12*cos((u/100)*pi)+15*sin(((v-20)/40)*pi)
        return c(u,v)
p = parametric_plot3d([x,y,z], (u, 0, 200), (v, 0, 40), frame=False)

I'm looking for a result, which is similar to: image description So I don't need a real surface, only the points.

How can I achieve this?

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1 Answer

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answered 2014-02-06 06:13:40 +0200

ppurka gravatar image

You can use the points function to do so. The only difference is that you will have to sample the function yourself. Here I am sampling it at [40, 40] points which is the default for parametric plot.

sage: pointlist = [(x(u,v), y(u,v), z(u,v)) for u in xrange(0, 200, 5) for v in xrange(40)]
sage: points(pointlist)
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Asked: 2014-02-06 03:31:16 +0200

Seen: 553 times

Last updated: Feb 06 '14