comp.lang.idl-pvwave archive: archive » non-rectangular array subset

Home » Public Forums » archive » non-rectangular array subset

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

Re: non-rectangular array subset [message #89452 is a reply to message #89450]

Fri, 17 October 2014 14:49

Chris Anderson
Messages: 3
Registered: August 2014

Junior Member

Jess,

Subsetting your data using the 'where' function will allow you to subset your data from your image arrays into one-dimensional vectors that can then be concatenated together into a single array. I'm sure this can be done in a cleaner fashion, but one potential example, given two images and some sort of threshold could be:

index1=where(image1 gt threshold,cnt)
if (cnt gt 0) then output_data=image1[index1]

index2=where(image2 gt threshold,cnt)
if (cnt gt 0) then output_data=[output_data,image2[index2]]

Your output_data vector then will contain a one-dimensional array of the values you have subset from your original images. All of your LAI values for the regions you are using will be in one array.

On Friday, October 17, 2014 6:42:07 AM UTC-7, Fabien wrote:
> Hi,
>
>
>
> A 2d grid of data is the same as an "image", and third or fourth
>
> dimensions (e.g. time or atmospheric levels) are simply a "pile of images".
>
>
>
> Depending on the size of your array you could do some dimension juggling
>
> (https://www.idlcoyote.com/tips/rebin_magic.html, case study 1) or use a
>
> loop over the other dimensions.
>
>
>
> Fabien

Report message to a moderator

[Message index]

		non-rectangular array subset By: jecca.baker on Fri, 17 October 2014 04:25
		Re: non-rectangular array subset By: Fabzi on Fri, 17 October 2014 04:36
		Re: non-rectangular array subset By: Fabzi on Fri, 17 October 2014 04:39
		Re: non-rectangular array subset By: jecca.baker on Fri, 17 October 2014 05:22
		Re: non-rectangular array subset By: Fabzi on Fri, 17 October 2014 06:42
		Re: non-rectangular array subset By: Chris Anderson on Fri, 17 October 2014 14:49

Previous Topic:	Converting days since 0-01-01 to Julian/Gregorian days - how can IDL recognise 0 AD?
Next Topic:	File time issue

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sun Oct 12 06:45:09 PDT 2025

Total time taken to generate the page: 0.79789 seconds