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Re: Little help on arrays [message #38032]

Mon, 16 February 2004 20:07

mchinand
Messages: 66
Registered: September 1996

Member

In article <4a097d6a.0402161953.238c2a73@posting.google.com>,
M. Katz <MKatz843@onebox.com> wrote:
> mchinand@midway.uchicago.edu (Mike Chinander) wrote in message news:> If
> you don't want to compare element by element, you could check to see if
> the max and min of
>> the difference of the two arrays are the same:
>>
>> IDL> if max(a-b) eq min(a-b) then print, 'bingo!'
>
> This gives the wrong result if there's a constant difference between
> the arrays. For example.
> a = [3,4,5,3]
> b = [2,3,4,2]
>
> then
> max(a-b) = max([1,1,1,1]) = 1
> yet
> min(a-b) = min([1,1,1,1]) = 1
> So they're equal, but the arrays aren't.
>
> M. Katz

Yes, I realized that after seeing someone else's similar solution which
does the needed check to make sure the max is equal to zero.

--Mike

--
Michael Chinander
m-chinander@uchicago.edu
Department of Radiology
University of Chicago

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[Message index]

		Re: Little help on arrays By: mchinand on Mon, 16 February 2004 20:07
		Re: Little help on arrays By: MKatz843 on Mon, 16 February 2004 19:53
		Re: Little help on arrays By: Foldy Lajos on Mon, 16 February 2004 12:13
		Re: Little help on arrays By: JD Smith on Mon, 16 February 2004 11:23
		Re: Little help on arrays By: Craig Markwardt on Mon, 16 February 2004 07:27
		Re: Little help on arrays By: Pepijn Kenter on Mon, 16 February 2004 07:12
		Re: Little help on arrays By: mchinand on Mon, 16 February 2004 07:12

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