Isletter2

Enhancement of the built-in function ISLETTER

For a string STR, ISCAPLETTER(STR) returns a vector with 1 for capital letters, -1 for small letters and 0 otherwise.

ISLETTER2(STR,'all') returns 1 if all components of STR are letters.

ISLETTER2(STR,'any') returns 1 if any component of STR is a letter.

Ex:
str='Matlab R12.1';

is_isletter=isletter(str);
is_isletter2=isletter2(str);
is_isletter2_all=isletter2(str,'all');
is_isletter2_any=isletter2(str,'any');

is_isletter =
1 1 1 1 1 1 0 1 0 0 0 0

is_isletter2 =
1 -1 -1 -1 -1 -1 0 1 0 0 0 0

is_isletter2_all =
0

is_isletter2_any =
1