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Re: ERROR: Attempt to subscript B with is out of range [message #89921 is a reply to message #89912]

Sat, 27 December 2014 10:32

dg86
Messages: 118
Registered: September 2012

Senior Member

On Wednesday, December 24, 2014 6:52:13 AM UTC-5, 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?

1. Here's a nice idiom for setting negative values to zero

b = b > 0.

An even more compact version:

b >= 0.

2. Masking large values similarly is quick and easy

threshold = 10000
b = b * (b le threshold)

The more compact version is

b *= b le threshold

Summarizing the quick way to achieve your goals
b >= 0. ; set negative values to zero
b *= b le threshold ; set large values to zero

TTFN,

David

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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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