Unrecognized flag ''{0}''. Valid flags are ''rows'', ''legacy''. Invalid input. Valid flags are ''rows'', ''legacy''. You cannot specify the ''{0}'' flag more than once. You can specify either ''legacy'' or ''R2012a'' but not both. The ''legacy'' flag must come last. The ''R2012a'' flag must come last. The ''rows'' input is not supported for cell array inputs. Input A of class {0} and input B of class {1} must be cell arrays of character vectors, unless one is a character vector. Inputs A and B must be matrices with the same number of columns in the ''rows'' case. Input A of class {0} and input B of class {1} must be the same class, unless one is double. Inputs A and B must be matrices with the same number of columns in the ''rows'' case. A must be a numeric, logical or char array. B must be a numeric, logical or char array. A or B must be double when A and B have different numeric types. The first and second input arguments must have the same type.