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help with - count in where() function [message #90868]

Thu, 30 April 2015 10:32

g.nacarts
Messages: 148
Registered: November 2013

Senior Member

Hi

I wrote a simple example of my code to understand the behaviour of count in the where() function but I still don't understand something.

My example:

array = [[-1,2,3,4,5],[6,-7,8,9,10]]
mask =bytarr(5,5)
for i=0L,4 do begin
for j=0L, 4 do begin
IF (TOTAL(ARRAY GT 5.)+ TOTAL(Array LT 0.)) EQ 0 THEN mask[i,j]=1
endfor
endfor

ind = where(mask EQ 1,count)
print, count
IDL> 0

print, total(array GT 5.)
> IDL 4.00000
print, total(array LT 0.)
> IDL 2.00000

I was expecting the answers in the two last prints. I don't understand why when I print out the count it's zero. Can anyone help?

Actually I was expecting to be 4 because there are 2 negatives and 4 greater than 5 so (2+4=6, thus 10-6=4).

Thanks

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[Message index]

		help with - count in where() function By: g.nacarts on Thu, 30 April 2015 10:32
		Re: help with - count in where() function By: Paul Van Delst[1] on Thu, 30 April 2015 10:58
		Re: help with - count in where() function By: Phillip Bitzer on Fri, 01 May 2015 07:33

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