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Please note that the recommended version of Scilab is 6.1.1. This page might be outdated.
See the recommended documentation of this function

Aide Scilab >> Chaînes de caractères > isnum


tests if a string represents a number

Calling Sequence

res = isnum(str)



A character string or a matrix of character strings.


A boolean matrix.


res = isnum(str)returns %T if str represents a number


isnum(['1'     , ..
       '-1.23' , ..
       '+1e+23', .. 
       '1d+23' , ..

See Also

  • isletter — check that characters of a string are alphabetics letters
  • isdigit — check that characters of a string are digits between 0 and 9
  • isalphanum — check that characters of a string are alphanumerics


  • P.M
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Last updated:
Thu May 12 11:45:00 CEST 2011