Simple function of three variables
v = flow
v = flow(n)
v = flow(x,y,z)
[x,y,z,v] = flow(...)
flow, a function of three variables, generates
fluid-flow data that is useful for demonstrating slice, interp3,
and other functions that visualize scalar volume data.
v = flow produces a 50-by-25-by-25
v = flow(n) produces a n-by-2n-by-n array.
v = flow(x,y,z) evaluates
the speed profile at the points x, y,
[x,y,z,v] = flow(...) returns
the coordinates as well as the volume data.
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