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array referencing problem ... [message #42954]

Tue, 08 March 2005 08:43

Andreas Brunn
Messages: 3
Registered: April 2003

Junior Member

dear listland
I have a problem referencing a three dimensional array with a two
dimensional mask. One solution I�m well aware of is building a two
dimensional array and copy this in each channel of the three dimensional.
But there must be a more elegant and memory saving method doing this, so i
tried the following and ran in an in my eyes a little bit strange behaviour:

ENVI> a=findgen(5,5,5)
ENVI> ma=where(a le 10)
ENVI> print, (a(*,*,1))(ma)
25.0000 26.0000 27.0000 28.0000 29.0000 30.0000 31.0000 32.0000 33.0000
34.0000 35.0000
thats what I hoped and expected as a result

but if I try the following:
ENVI> (a(*,*,1))(ma) = 2
% Expression must be named variable in this context: <FLOAT Array[5, 5]>.
% Execution halted at: $MAIN$

I only get that error message, where is my mistake ?

Is there a way applying this mask on each of the channels without copying
each channel in a two dimensional array ?

thanx a lot in advance

Andi

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[Message index]

		array referencing problem ... By: Andreas Brunn on Tue, 08 March 2005 08:43
		Re: array referencing problem ... By: marc schellens[1] on Wed, 09 March 2005 23:01
		Re: array referencing problem ... By: David Fanning on Tue, 08 March 2005 16:02

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