How do you overload a built-in function if it has no parameters?
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In order to debug some code, I'm trying to overload the rand and randn functions. I re-arranged some code to better take advantage of vector operations but the liberal use of the rand and randn functions are making it difficult to compare results against the original code. Long story short, I want to create versions of the rand and randn functions that output constant values.
I've had no problem overloading the functions when I specificy output dimensions (e.g. rand(3,1)) but I am at a loss as to how to override the no parameter version which outputs a single scaler. No parameter means no data type to associate the overloaded function with.
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Answers (2)
Jan
on 27 Oct 2011
The rand.m file must only appear early in the Matlab path.
function R = rand(varargin)
switch nargin
case 0
R = 3;
case 1
R = repmat(3, varargin{1}, varargin{1});
otherwise
R = repmat(3, [varargin{:}]);
end
Daniel Shub
on 27 Oct 2011
Another option would be to reset the random number generator prior to running the original version and then again before running the new version.
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