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Re: ERROR: Attempt to subscript B with is out of range [message #89913 is a reply to message #89912]

Wed, 24 December 2014 06:28

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

On Wednesday, December 24, 2014 12:52:13 PM UTC+1, g.na...@gmail.com wrote:
> Hi
>
> I've got a 3D array B[100,200,200]. My array B sometimes contains negative values and other times very large values. In order to make sure that when there are either negative or very large values will set to zero I wrote the following code:
>
> FOR i=0L,199 DO BEGIN
> FOR j=0L,199 DO BEGIN
> WRONG = total((B[*,i,j] LT 0) OR (B[*,i,j] GT 10000))
> IF WRONG GT 0 THEN B[*,i,j]=0
> ENDFOR
> ENDFOR
>
> I got the error Attempt to subscript B with j is out of range. I cannot figure out with this happen with the j variable. Any idea?

Hi,
that's not the IDL way. Here is one way of doing it (didn't check, but I think it is also a lot faster):

;create an array
b = long(randomu(s,100,200,200)*100)
b[50,100,100] = -12
b[51,101,101] = 20000
;look for the bad values
pos = where((a lt 0) or (a gt 10000), cnt)
if cnt gt 0 then b[pos]=0l

There are other ways of doing this sort of search for values in an array. Have a look at older posts.

Cheers,
h

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[Message index]

		ERROR: Attempt to subscript B with is out of range By: g.nacarts on Wed, 24 December 2014 03:52
		Re: ERROR: Attempt to subscript B with is out of range By: Helder Marchetto on Wed, 24 December 2014 06:28
		Re: ERROR: Attempt to subscript B with is out of range By: wlandsman on Wed, 24 December 2014 07:00
		Re: ERROR: Attempt to subscript B with is out of range By: dg86 on Sat, 27 December 2014 10:32

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