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Re: All twisted up over reverse indices! [message #94003 is a reply to message #93998]

Mon, 19 December 2016 09:37

Stephen Williams
Messages: 1
Registered: December 2016

Junior Member

>
> I found this helped (scroll down to the section on reverse indices):
> http://www.idlcoyote.com/tips/histogram_tutorial.html

For completeness, I figured out the problem and determined how to extract what I needed. My issue came primarily from improper referencing of the arrays. For example, the following line gave the incorrect indices when used with multiple matches:

ra_i_m(i) = ra_i(match1[match1[part_two(i)]:match1[part_two(i+1)]-1])

The problem is in the end, and should be this:

ra_i_m(i) = ra_i(match1[match1[part_two(i)]:match1[part_two(i)+1]-1])

The parentheses are critical here, as I want the next array element in "match1" and not the next array element in "part_two".

Distances were obtained similarly via the following line:

d(match1[match1[part_thr(i)]:match1[part_thr(i)+1]-1])

That is to say, the above gives the distances for each element in the sub-array denoted by the ":".

I hope this may help someone, I am sure relieved that my problem has been solved.

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[Message index]

		Re: All twisted up over reverse indices! By: PMan on Fri, 16 December 2016 05:37
		Re: All twisted up over reverse indices! By: Stephen Williams on Mon, 19 December 2016 09:37
		Re: All twisted up over reverse indices! By: penteado on Mon, 19 December 2016 12:45

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