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Re: Where problem [message #69607 is a reply to message #35914]

Fri, 05 February 2010 04:01

d.poreh
Messages: 406
Registered: October 2007

Senior Member

On Feb 4, 8:20 am, JJ <j...@cornell.edu> wrote:
> The value_locate() solution may work for you, but it will really only
> work in pretty specific cases. The X vector must be monotonically
> increasing (though you could first sort the list). Even if the values
> you're looking for are not in X, a valid result will be returned -
> since value_locate() returns the index of the start of the "interval
> into which the given value falls" (this issue addressed by wox).
>
> If you want a simple and robust solution to this kind of problem (and
> many others), I highly recommend Craig Markwardt's cmset_op routine
> (follow the Array/Set link from the Markwardt IDL Library page athttp://www.physics.wisc.edu/~craigm/idl/idl.html).
>
> With cmset_op you would do something like:
>
> index = cmset_op (x, 'and', y, /index)
>
> Of course, if there are multiple entries in your array that have the
> same value, and you want to find the indices of all of those
> locations, you might want to do a where on each element of y.
>
> -JJ

Thanks JJ.
Cheers

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[Message index]

		WHERE problems (longish) By: Benjamin Panter on Tue, 22 July 2003 08:23
		Re: Where problem By: d.poreh on Fri, 05 February 2010 04:01
		Re: Where problem By: JJ on Thu, 04 February 2010 08:20
		Re: Where problem By: d.poreh on Thu, 04 February 2010 02:30
		Re: Where problem By: Wout De Nolf on Thu, 04 February 2010 02:26
		Re: Where problem By: Wout De Nolf on Thu, 04 February 2010 02:22
		Re: Where problem By: Foldy Lajos on Thu, 04 February 2010 01:59
		Re: Where problem By: d.poreh on Thu, 04 February 2010 01:47
		Re: Where problem By: Foldy Lajos on Thu, 04 February 2010 01:33

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