Unrecognized flag ''{0}''. Valid flags are ''rows'', ''first'', ''last'', ''stable'', ''sorted'', ''legacy''. Invalid input. Valid flags are ''rows'', ''first'', ''last'', ''stable'', ''sorted'', ''legacy''. You cannot specify the ''{0}'' flag more than once. You can specify either ''first'' or ''last'' but not both. You can specify either ''sorted'' or ''stable'' but not both. You can specify either ''legacy'' or ''R2012a'' but not both. The ''legacy'' flag must come last. The ''R2012a'' flag must come last. You cannot specify ''stable'' and ''sorted'' with ''first'' and ''last''. You cannot specify ''stable'' and ''sorted'' with ''legacy'' and ''R2012a''. The ''rows'' input is not supported for cell array inputs. Cell array input must be a cell array of character vectors. Elements of cell array input A must be character vectors (row vectors of class char). Input A must be a matrix in the ''rows'' case.