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efficient function parameter copying?

From: Michael Pronath
Subject: efficient function parameter copying?
Date: Fri, 10 Sep 1999 11:03:29 +0200

If I declare a function in octave

   function v = f(v)

and then call it by

   X = f(X);

the octave interpreter could exploit that the variable X need not
be copied into v, but could be changed directly.
I'm using a construct like the one for iterations, i.e. calling
f quite often, with X being a matrix.  Using global variables could
do it as well, but are not as beautiful.  So my question is, 
does the octave interpreter detect this case and optimize parameter
copying, or is the matrix X copied twice unnecessarily here?


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