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Re: Testing validity of numerical content of a string [message #51824 is a reply to message #51744]

Thu, 07 December 2006 09:43

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

Sven Geier wrote:
> In a pinch one might just force the conversion and catch any resulting
> error-messages with ON_ERROR -- that's ugly, but might be a lot easier than
> trying to parse strings...

So here's some code that does that:

function validate_numeric, value
compile_opt strictarr

on_ioerror, badValue

f = float(value)
return, 1B

badValue: return, 0B
end

The odd thing about this is what IDL will do without complaining. IDL
will do this without any error:

IDL> help, float('0.0hello5')
<Expression> FLOAT = 0.00000

but draws the line at:

IDL> help, float('hello5')
% Type conversion error: Unable to convert given STRING to Float.
% Detected at: $MAIN$
<Expression> FLOAT = 0.00000

Mike
--
www.michaelgalloy.com

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[Message index]

		Testing validity of numerical content of a string By: Y.T. on Wed, 06 December 2006 17:29
		Re: Testing validity of numerical content of a string By: Brian Larsen on Thu, 07 December 2006 10:18
		Re: Testing validity of numerical content of a string By: Bob[3] on Thu, 07 December 2006 10:08
		Re: Testing validity of numerical content of a string By: Michael Galloy on Thu, 07 December 2006 09:43
		Re: Testing validity of numerical content of a string By: Sven Geier on Wed, 06 December 2006 22:21

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