save Save point cloud object as mat file.
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  DESCRIPTION/NOTES
  * Point cloud object is saved as variable 'obj' in mat file.
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  INPUT
  1 [path]
    Path to mat file.
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  EXAMPLES
  1 Import, save and load a point cloud.
    pc = pointCloud('Lion.xyz');
    pc.save('Lion.mat');
    clear; % clear all variables
    pc = pointCloud('Lion.mat'); % load from mat file
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  philipp.glira@gmail.com
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