Follow this link: http://people.sc.fsu.edu/~jburkardt/m_src/ply_display/ply_display.m
and save this file.
ply_display.m is a Matlab function (unlike the Matlab script). Matlab function usually requires input. You can call the ply_display function while in the same folder as the .m file. You call it this:
ply_display('file.ply') %where %'file.ply' is the name of the file
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