strcmp compare character strings res = strcmp(string_one, string_two, ['i']) string_one a character string or matrix of character strings. string_two a character string or matrix of character strings. 'i' an optional parameter to do strcmpi (case independent), default value is 's'. res a matrix of integers. res = strcmp(string_one, string_two) (or res = strcmp(string_one, string_two, 's')) returns an integral value indicating the relationship between the strings. The value greater than zero indicates that the first character that does not match has a greater value in string_one than in string_two and the value less than zero indicates the opposite (lexicographical order). The value equal zero indicates that string_one and string_two are equal. res = strcmp(string_one, string_two, 'i') returns 0 if string_one is equal to string_two (case independently) and 1 indicates the opposite. strcat strcmpi