StringIsNumber

STRINGISNUMBER returns 1 if the input string contains only a number and otherwise a zero.

Description

STRINGISNUMBER returns 1 if the input string contains only a number and otherwise a zero
 
Created as an example for the thread "How to determine if an inputfield contains chars or numbers ?"
 
  USAGE:
  >> StringIsNumber('aseea')
  ans = 0
  >> StringIsNumber('333')
  ans = 1
  >> StringIsNumber('333.123')
  ans = 1
  >> StringIsNumber('.123')
  ans = 1
  >> StringIsNumber('0.123')
  ans = 1
  >> StringIsNumber('0.123a')
  ans = 0
  
  IT'S NOT FANCY BUT IT WORKS

• MATLAB release: MATLAB 7.0.1 (R14SP1)

[Jaroslaw Tuszynski]

Simple robust function. Does not recognize negetive numbers and scientific notation. Nice alternative to ~isempty(str2num(str)) approach which sametimes gives strange results (try str = 'sphere' ).

[Jan Simon]

Another idea:
  [x, count, err, next] = sscanf(Str, '%g', 1);
  isNumber = (count == 1) && (next == numel(Str) + 1);