Ruqayya - how are you calling uq_dist? You have to supply a function handle to some function that is the first parameter to the above function. For example
funfcn = @myFunction;
where (according to the code you supplied at your previous post at 158389), funfcn is a source density function given in an m-file with at most three parameters, p1,p2,p3.
If this code is from Contemporary Communication Systems Using MATLAB, then there should be some examples that illustrate the use of the uq_dist function and the parameters that are passed to it.
