isnum

tests if a string represents a number

Calling Sequence

res = isnum(str)

Arguments

:str A character string or a matrix of character strings. : :res A boolean matrix. :

Description

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

Examples

isnum(['1'     , ..
       '-1.23' , ..
       '+1e+23', ..
       '1d+23' , ..
       '%pi'])

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