.TH isnum 1 WCSTools "6 November 2015"
.SH Name
isnum \- Return code telling whether the input string is numerical
.SH Synopsis
isnum string
.br
.SH Description
.I isnum
is a utility for identifying and classifying an input string.
<B>isnum</B> returns an integer code depending on how it identifies the 
input number:
0: string is not any sort of number
1: String is an integer
2: String is a floating point number
3: String is a hh:mm:ss.ss time
4: String is a yyyy-mm-dd date

.SH Author
Jessica Mink, SAO (jmink@cfa.harvard.edu)