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Index should be out of range, right? [message #64519]

Wed, 31 December 2008 11:42

T.H.
Messages: 13
Registered: December 2008

Junior Member

2008 is ending in confusion for me. Here is an example of why:

IDL> x=intarr(10,10)
IDL> y=indgen(15)
IDL> x[y,y]=1
IDL> print, x
1 0 0 0 0 0 0 0
0 0
0 1 0 0 0 0 0 0
0 0
0 0 1 0 0 0 0 0
0 0
0 0 0 1 0 0 0 0
0 0
0 0 0 0 1 0 0 0
0 0
0 0 0 0 0 1 0 0
0 0
0 0 0 0 0 0 1 0
0 0
0 0 0 0 0 0 0 1
0 0
0 0 0 0 0 0 0 0
1 0
0 0 0 0 0 0 0 0
0 1

This is confusing because some values of y are greater than the
dimensions of the array that they are being used to access and in
fact

IDL> x[y[10],y[10]]=1
% Attempt to subscript X with <INT ( 10)> is out of range.
% Execution halted at: $MAIN$

this fails. Why do I not get an "out of range error" in the first
case?

Thanks for your help.

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