MATLAB: 3d plot-surf

surf

Dear all,

I have a 2d matrix (2358*2) which corresponds to the points of a 2d grid (A: x-y data). These points do not define a rectangle. A second matrix (B: 2358*1) represents a specific variable corresponding to each of the gird points. What I want to show is the a 3D representation of these two matrices; so that I can get the surface of B over the grid points (A). The function 'surface' may work but I could not apply it as I do not have exactly a fully rectangle grid.

What I need to get as the end needs to look like a 3d topography.

Your great help would be appreciated, many thanks.

Reyhaneh

Best Answer

You have a couple of options. We were just discussing them in this other thread. In that case they wanted a 2D color representation, but you can use the same techniques for a 3D surface. In that case, the "pcolor" becomes "surf", and leave the "view(2)" out of the trisurf example.

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MATLAB: How to make a permanent change to a matrix using sortrows

 P = sortrows(P,7) ;

Most of the time functions don't operate "externally", so SORTROWS doesn't alter your array P defined in the workspace. It creates a new sorted array that it outputs. You have to store this output back into P if you want P to be the sorted version. If you wanted to keep the original, you could store it into a new variable:

 P_sorted = sortrows(P,7) ;

MATLAB: How to display a vector as colorplot of to other vectors

If you have a point cloud, the scatter3 or plot3 functions would work. There are a number of options for coloring the points.

If you want to grid them at some point, see if scatteredInterpolant will do what you want.

Best Answer

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MATLAB: How to make a permanent change to a matrix using sortrows

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