godarda@gd:~$ octave
...
octave> gd = "GoDarda#12"
gd = GoDarda#12
octave> isalpha(gd)
ans =

  1  1  1  1  1  1  1  1  1  1  1  1  0  0  0

octave> isalnum(gd)
ans =

  1  1  1  1  1  1  1  1  1  1  1  1  0  1  1

octave> isdigit(gd)
ans =

  0  0  0  0  0  0  0  0  0  0  0  0  0  1  1

octave> isascii(gd)
ans =

  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1

octave> isletter(gd)
ans =

  1  1  1  1  1  1  1  1  1  1  1  1  0  0  0

octave> isupper(gd)
ans =

  1  0  0  0  0  0  0  0  0  0  0  0  0  0  0

octave> islower(gd)
ans =

  0  1  1  1  1  1  1  1  1  1  1  1  0  0  0

octave> isspace(gd)
ans =

  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0