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where, or, and loops. There has to be a better way. [message #83474]

Fri, 08 March 2013 15:47

anniebryant@gmail.com is currently offline

anniebryant@gmail.com
Messages: 16
Registered: March 2009

Junior Member

Please see the below example to demonstrate my problem:

--------------------------------

; This is a large floating point array of river basins
huc = fltarr(4800,4800)

; IDs of the basins I want to extract
NEW = [1102,1103,1104,1105]

; Find where the basins are
pos = where(huc eq NEW[0] or $ ; IS THIS THE ONLY WAY TO FIND THE VALUES IN THE LARGER ARRAY??
huc eq NEW[1] or $
huc eq NEW[2] or $
huc eq NEW[3])

; Create new array and insert basins
key = intarr(4800,4800)

key(pos) = 1
---------------------------------

THe issue here is, what happens when the 'NEW' variable has 300 values in it? Do I have to go through 300 iterations of:

pos = where(huc eq NEW[1] or $
............... or $
huc eq NEW[299])

I hope someone has found a way around this.

Thanks for any ideas you can give!!!
Annie

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[Message index]

		where, or, and loops. There has to be a better way. By: anniebryant@gmail.com on Fri, 08 March 2013 15:47
		Re: where, or, and loops. There has to be a better way. By: Jeremy Bailin on Fri, 08 March 2013 15:55
		Re: where, or, and loops. There has to be a better way. By: wlandsman on Fri, 08 March 2013 16:30
		Re: where, or, and loops. There has to be a better way. By: cgguido on Fri, 08 March 2013 16:22

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