Re: [Maxima-discuss] How to make a 3d surface plot from 2d data matrix?

[德馬堤 <d00...@nt...>]

Nice attempt! A more general version is


M:matrix([1,2,2],[4,5,3],[7,8,4],[10,11,5])$

f(x, y) := float('M[round(x), round(y)])$
plot3d (f(x,y), [x,1,length(M)], [y,1,length(M[1])], [grid,length(M)-1,length(M[1])-1])$

Note that the matrix M is not necessarily a square matrix.

Let's say the vectors X and Y have been used to generate the data stored in M. They are the actual positions on the x and y axes where the data points are located.
Above version locates them always at 1, 2, 3, etc., but this is not a general case.


Also, I would prefer the color of the surface to change smoothly with the surface height.

Using round(x) and round(y) is nonsmooth.