function values=exprand(mu,n,m);

% Usage:   V = exprand( mu)        % for 1 x 1

%    or    V = exprand( mu, n)     % for n x n

%    or    V = exprand( mu, n, m)  % for n x m

%

% computes a matrix of size n x m, exponentially distributed 

%     with mean mu      (see also unirand, normrand, rand)

if nargin < 1, help exprand, return, end

if nargin == 1, 

    n=1; m=1;

elseif nargin == 2, 

    m=n;

end

 z=rand(n,m);

 z=-log(1-z)*mu;

 values=z;