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array subscripts [message #46397]

Mon, 14 November 2005 07:07

sebinjapan
Messages: 14
Registered: June 2004

Junior Member

Hi,

Hi,

I found a strange feature when using out of bounds subscripts.
I am using IDL 6.2 for Mac OSX
there is a short example:

IDL> a=indgen(4)
IDL> print, a[-1]
% Attempt to subscript A with <INT ( -1)> is out of range.
% Execution halted at: $MAIN$

that's ok, but that happens if we use the array [-1] instead of the scalar
-1 as the subscript address

IDL> print, a[[-1]]
0

well... looks like print, a[ 0 > [-1] ]

Same idea for "too large" subscripts
IDL> print, a[4]
% Attempt to subscript A with <INT ( 4)> is out of range.
% Execution halted at: $MAIN$
IDL> print, a[[4]]
3

IDL> print, a[indgen(8)-2]
0 0 0 1 2 3 3 3

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