From help-request at octave dot org Sun Feb 13 07:29:50 2005
Subject: Select elements according to the index
From: "Chen, Minyu" <mchenl at essex dot ac dot uk>
To: <help at octave dot org>
Date: Sun, 13 Feb 2005 13:32:25 -0000



Hi:

Sorry if my question seems too simple.

Suppose I have an index matrix of 2 by 3, e.g. a=3D[1 2 3; 4 5 6]

And have a vector of 1 by 8, e.g. b=3D[.1 .2 .3 .4 .5 .6 .7 .8]

And I want to create a matrix c of 2 by 3 (the same dimension of a),
with c(i,j)=3Db(a(i,j)), that's being said:

c=3D[.1 .2 .3; .4 .5 .6]

In matlab, as memory serves correctly, I can do it by typing:

c=3Db(a)

but this command in Octave will generate only a vector of 1 by 6:

c=3D[.1 .4 .2 .5 .3 .6]

How can I get the matrix I want?

Many Thanks,
Minyu Chen



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