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Re: Comparing 2 arrays [message #55559 is a reply to message #55558]

Sun, 26 August 2007 02:39

airy.jiang
Messages: 37
Registered: May 2007

Member

On 8 26 , 1 25 , te...@atmsci.msrc.sunysb.edu wrote:
> 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- -
>
> - -

I suggest use the IDL function Array_Equal,that's a direct way.

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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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