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Re: Comparing 2 arrays [message #55561 is a reply to message #55559]

Sat, 25 August 2007 22:25

teich
Messages: 33
Registered: May 2007

Member

On Aug 26, 12:47 am, David Fanning <n...@dfanning.com> wrote:
> David Fanning writes:
>> If your arrays are the same size, there is no problem using structures.
>> You could subtract the two values and call the result "equal" if
>> the difference was "sufficiently" close to zero.
>
>> IF Total( (data1.A - data2.B) LT 1e-6) EQ N_Elements(data1.A) THEN $
>> Print, 'The arrays are equal' ELSE Print, 'The arrays are unequal'
>
> Well, you probably need to check whether the absolute
> value of the difference (ABS) is sufficiently close to
> zero. But other than that, I think this should work.
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

Thanks David for showing me the clever way of doing this!

Howard

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[Message index]

		Re: Comparing 2 arrays By: David Fanning on Mon, 27 August 2007 08:06
		Re: Comparing 2 arrays By: Conor on Mon, 27 August 2007 06:48
		Re: Comparing 2 arrays By: David Fanning on Sun, 26 August 2007 09:43
		Re: Comparing 2 arrays By: Jean H. on Sun, 26 August 2007 08:40
		Re: Comparing 2 arrays By: David Fanning on Sun, 26 August 2007 07:32
		Re: Comparing 2 arrays By: airy.jiang on Sun, 26 August 2007 02:39
		Re: Comparing 2 arrays By: teich on Sat, 25 August 2007 22:25
		Re: Comparing 2 arrays By: David Fanning on Sat, 25 August 2007 21:47
		Re: Comparing 2 arrays By: David Fanning on Sat, 25 August 2007 21:45
		Re: Comparing 2 arrays By: David Fanning on Tue, 28 August 2007 08:15
		Re: Comparing 2 arrays By: James Kuyper on Mon, 27 August 2007 10:40
		Re: Comparing 2 arrays By: Paul Van Delst[1] on Mon, 27 August 2007 10:52

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