MatrixCellTo3D:

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   Convert a cell array of p x p matrices into a 3D matrix. Since Version
   11.
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   Form:
   m = MatrixCellTo3D( c )
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   ------
   Inputs
   ------
   c             {n}       Cell array of m x m matrices

   -------
   Outputs
   -------
   m             (p,p,n)	3D matrix

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