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Logical indexing and Octave manual example
From: |
Tim Largy |
Subject: |
Logical indexing and Octave manual example |
Date: |
Wed, 5 Mar 2008 19:02:42 -0500 |
I'm having trouble understanding an example in section 4.4 "Logical
Values" of the Octave manual
(http://www.gnu.org/software/octave/doc/interpreter/Logical-Values.html#Logical-Values).
The manual has:
data = [ 1, 2; 3, 4 ];
idx = (data <= 2);
data(idx)
=> ans = [ 1; 4 ]
However my Octave version 2.1.73 (i686-pc-cygwin) returns a different result:
octave:72> data = [ 1, 2; 3, 4 ];
octave:73> idx = (data <= 2);
octave:74> data(idx)
ans =
1
2
In neither case can I understand the underlying logic. The value of
idx is [1, 1; 0, 0]. What rules determine how a matrix such as this is
used in logical indexing?
Regards,
Tim Largy
- Logical indexing and Octave manual example,
Tim Largy <=