comp.lang.idl-pvwave archive: archive » rebinning two arrays? or re: finding exclusive elements between 2 not-quite identical arrays?

Home » Public Forums » archive » rebinning two arrays? or re: finding exclusive elements between 2 not-quite identical arrays?

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

rebinning two arrays? or re: finding exclusive elements between 2 not-quite identical arrays? [message #89750]

Fri, 28 November 2014 08:54

havok2063
Messages: 24
Registered: December 2012

Junior Member

So this post is related to my original post here, but it's not quite working out.
https://groups.google.com/forum/#!topic/comp.lang.idl-pvwave /CtiGTuNqD10

...

So I have two arrays where I need to extract the elements in one array not in the other, but the elements are not quite exact to one another.

A = [309, 313, 318, 322, 327, 331, 336, 340]
B = [305, 309, 314, 318, 323, 327, 332, 336, 341, 345]

B is the true array, and A is the "found" array that is missing some elements. I want to find all elements missing from A that exist in B.

The solution I adopted, from the previous post, is something like

diff = 2 ; offset between integers
temp = value_locate(A,B)
missloc = where(B-A[temp] gt diff and A[temp+1]-B gt diff, misscount)

This mostly works, however it does not work when the elements that are missing are the edges, i.e. the first or last element.

I can't seem to get value_locate to chunk the two together the way I want. Is there a way to rebin A so that the elements in A that are the same match those in B, e.g. 309=309, 313 changes to 314, 322 changes to 323, etc? So the elements match up, so then I could do a simple thing like this

missloc = where(histogram(A, omin=om) eq 0 and histogram(B, min=om) ne 0) + om

However, I tested this out by forcing the like elements to be the same, and this also does not work when the missing elements are the first and last elements. It only seems to work when the missing elements are internal, i.e when there is at least 1 common element first.

Any suggestions on a more robust solution for either problem?

Thanks, Brian

Report message to a moderator

[Message index]

		rebinning two arrays? or re: finding exclusive elements between 2 not-quite identical arrays? By: havok2063 on Fri, 28 November 2014 08:54
		Re: rebinning two arrays? or re: finding exclusive elements between 2 not-quite identical arrays? By: Heinz Stege on Fri, 28 November 2014 10:49
		Re: rebinning two arrays? or re: finding exclusive elements between 2 not-quite identical arrays? By: havok2063 on Fri, 28 November 2014 11:05

Previous Topic:	cgimage/overlaid grid
Next Topic:	Confusion about nthread and ncore

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 15:06:28 PDT 2025

Total time taken to generate the page: 0.00384 seconds