function NX=rvsynth(X, cf) 
% rvsynth(X, cf)  Synthesizes a random variable matrix by using F() inverse 
%    for the given cumulative function to act on a the random variable 
%    matrix X.  X should only have valid probability values (>=0, <=1). 
if iscf(cf)==0 
   error('invalid cumulative function') 
end 
NX=zeros(size(X)); 
s=size(X); 
for i=1:s(1), 
   NX(i,:)=xval(cf, X(i,:)); 
end