the PTC Mathcad help say if i want to use a matrix as Input Data for 3D Plots there are 2 ways:
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Please see the worksheet provided. The first plot uses the CreateMesh() function, a fast and preferred method for creating 3D plots.
The matrix is unrolled for the second plot, resulting in three columns of data: x, y, and f(x,y). You'll notice how time-consuming it is, as well as how the plot quality suffers.