SortColumnCell:

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   Sort a nxm cell array by the values in the first column.

   Type SortColumnCell for a demo.

   Since version 10.
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   Form:
   s = SortColumnCell( x )
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   ------
   Inputs
   ------
   x              {m,n}  Cell array
   -------
   Outputs
   -------
   s              {m,n}  Cell array

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