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Re: Little help on arrays [message #38040 is a reply to message #38033]

Mon, 16 February 2004 12:13

Foldy Lajos
Messages: 268
Registered: October 2001

Senior Member

On Mon, 16 Feb 2004, Craig Markwardt wrote:

>
> Nuno Oliveira <nmoliveira@fc.ul.pt> writes:
>
>
>> How do I compare one array with another? I want to avoid comparing
>> position per position.
>>
>> IDL> if [1,1] eq [1,1] then print, 'bingo!'
>> % Expression must be a scalar or 1 element array in this context: <BYTE
>> Array[2]>.
>> % Execution halted at: $MAIN$
>
> The other posters have good ideas. My own idiom for this comparison
> is:
>
> if total(abs(X-Y)) EQ 0 then print, 'bingo!'
>
> Craig
>
>

Hi,

I think

if min(x-y, max=max) eq max then print, 'bingo!' ; for integer arrays

is about 20% faster for arrays greater than cache memory.

regards,
lajos

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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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