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Re: array subscripting problem [message #43425 is a reply to message #43423]

Mon, 11 April 2005 06:38

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Martin Doyle writes:

> I've got a gridded dataset and I'm searching the grid trying to find
> those points which have a certain value. Once I've found this point, I
> want to check all points around it to see if they have the same value
> plus a little bit. This is what I've come up with:
>
> If (data(i,j,k) GE p) THEN begin
>
> cd = data(i,j,k)
>
> If(ABS(cd-data[i-1,j-1,k]) LE mg) then f = f+1
> If(ABS(cd-data[i, j-1,k]) LE mg) then f = f+1
> If(ABS(cd-data[i+1,j-1,k]) LE mg) then f = f+1
> If(ABS(cd-data[i-1,j, k]) LE mg) then f = f+1
> If(ABS(cd-data[i+1,j, k]) LE mg) then f = f+1
> If(ABS(cd-data[i-1,j+1,k]) LE mg) then f = f+1
> If(ABS(cd-data[i, j+1,k]) LE mg) then f = f+1
> If(ABS(cd-data[i+1,j+1,k]) LE mg) then f = f+1
>
> endif
>
> However, array subscripting with negative numbers isn't allowed by
> IDL.
>
> Has anyone any ideas how I might get around this?

array[0 > j]

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: array subscripting problem By: Benjamin Luethi on Mon, 11 April 2005 08:11
		Re: array subscripting problem By: Martin[1] on Mon, 11 April 2005 06:56
		Re: array subscripting problem By: David Fanning on Mon, 11 April 2005 07:34
		Re: array subscripting problem By: David Fanning on Mon, 11 April 2005 06:38

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