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Re: converting strings into numerical or string data depending on the contents [message #81581]

Tue, 02 October 2012 16:26

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Tuesday, October 2, 2012 7:09:23 PM UTC-4, M. Katz wrote:
> I'm looking for a way to elegantly transform string values:
>
> (a) keeping it as string-type when the string does not contain only numbers
>
> (b) convert into numeric-type data when appropriate.
>

You could look at the functions http://idlastro.gsfc.nasa.gov/ftp/pro/misc/valid_num.pro
and http://idlastro.gsfc.nasa.gov/ftp/pro/misc/strnumber.pro

The first uses stregex to identify a valid number, while the second traps a conversion error. They could be used like

if strnumber(x,value) then x = value
if valid_num(x,value) then x = value

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