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StringIsNumber

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StringIsNumber

by Michael Robbins

 

15 Nov 2004 (Updated 22 Nov 2004)

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

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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)
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Everyone's Tags
expression, number, regex, regexp, regexprep, regular, string, strings
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Comments and Ratings (2)
08 Jul 2010 Jan Simon

Another idea:
[x, count, err, next] = sscanf(Str, '%g', 1);
isNumber = (count == 1) && (next == numel(Str) + 1);
07 Jul 2006 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' ).
Updates
18 Nov 2004

A single period is no longer considered a number. It must be succeeded by a digit.

Vector inputs and outputs are supported.
22 Nov 2004

Digits followed by a period but no more digits is now considered a number.

A single period is no longer considered a number.

Vector inputs and outputs are supported.

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