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array subscripting problem [message #43426]

Mon, 11 April 2005 06:00

m.doyle
Messages: 6
Registered: January 2004

Junior Member

Hi Guys,

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?

Many thanks!

All the best
Martin

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[Message index]

		array subscripting problem By: m.doyle on Mon, 11 April 2005 06:00
		Re: array subscripting By: David Fanning on Fri, 11 December 2009 08:43
		Re: array subscripting By: David Higgins on Fri, 11 December 2009 08:29
		Re: array subscripting By: David Fanning on Fri, 11 December 2009 06:41

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