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Re: how to get the index of the maximum element in each row for a 2D matrix efficiently [message #36284 is a reply to message #36279]

Sat, 30 August 2003 13:33

henrygroe
Messages: 30
Registered: August 2003

Member

>
> Starting with v5.6, MAX will do this for you with its own DIMENSION
> keyword. Remember that in IDL dimensions start, perversely, with 1,
> as opposed to everything else, which is 0 based. As of now we can
> thread the following:
>
> TOTAL
> PRODUCT
> MIN
> MAX
> MEDIAN
>
> The only remaining operators I wish could be dimensionally threaded in
> this way are AND, OR, and especially the new && and ||
> short-circuiting ops.
>
> JD

Standard deviation or variance is also a useful function; e.g. if you
have a stack of images and want the stdev in each pixel. (I wrote a
bunch of call_external fortran routines to do all these before v5.6;
I think stdev_in_1d is the only one that has not been made redundant.)

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[Message index]

		Re: how to get the index of the maximum element in each row for a 2D matrix efficiently By: JD Smith on Tue, 02 September 2003 10:12
		Re: how to get the index of the maximum element in each row for a 2D matrix efficiently By: henrygroe on Sat, 30 August 2003 13:33
		Re: how to get the index of the maximum element in each row for a 2D matrix efficiently By: the_cacc on Fri, 29 August 2003 17:33
		Re: how to get the index of the maximum element in each row for a 2D matrix efficiently By: xje4e on Fri, 29 August 2003 15:23
		Re: how to get the index of the maximum element in each row for a 2D matrix efficiently By: JD Smith on Fri, 29 August 2003 12:05

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