Plot a 3D contour

Xu
2012 6 23
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I know it is applicable to plot a 2D contour for a function with 3 variables. For example, use contour(x,y,z) to plot a function z=ax+by.
Now here is my question. I have a function f=ax+by+cz, where a,b,c are constant, x,y,z are variables. I have to plot a 3D contour, for example, the contour for f=0.
Thanks in advance.

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Walter Roberson
Walter Roberson 2012-6-23

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contour_at = 0;
isosurface(x, y, z, f, contour_at)

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