Re: Single value from 2D array

From: Adam Phillips <asphilli_at_nyahnyahspammersnyahnyah>
Date: Wed, 05 Apr 2006 15:39:39 -0600

Hi Brooke,

I think the easiest thing to do is to use the ind function:

ncl 0> data = (/4,7,3,7,0,9,1,2/)
ncl 1> aind = ind(
ncl 2> print(aind)

Variable: aind
Type: integer
Total Size: 12 bytes
             3 values
Number of Dimensions: 1
Dimensions and sizes: [3]
(0) 1
(1) 3
(2) 5
ncl 3> print(sum(data(aind)))
(0) 23

Note that the syntax data(aind) will only select those indices stored in
aind. Thus, sum(data(aind)) will sum up the values associated with the
1st, 3rd, and 5th indices of the array data... Finally, ind only accepts
1D arrays, so you will have to use ndtooned before you do any of this...

Brooke A. Halvorson wrote:
> I am attempting to take a 2D array and extract each of the values and sum them
> up (if they meet a certain threshold) to give me one,single integer. It
> ultimately does not matter if I keep the location (as the 2D array values are
> associated with gridpoints, not latitude/longitude) since all I want to do is
> sum up the values to give me one number.
> This seems like a relatively easy thing to do yet I have been struggling. Is
> NCL capable of this procedure and if so, how? Thank you, in advance, for any
> suggestions.
> Brooke

Adam Phillips			   
National Center for Atmospheric Research   tel: (303) 497-1726
ESSL/CGD/CAS                               fax: (303) 497-1333
P.O. Box 3000				
Boulder, CO 80307-3000
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Received on Wed Apr 05 2006 - 15:39:39 MDT

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