This function generates the nearly balanced concurrence matrix from given number of treatments (v), number of blocks (b) and block size (k) by trial and error.
ccmat(v,b,k)Number of treatments
Number of blocks
Block size
A v by v matrix is returned if a desired concurrence matrix is found, else it returns a v by v matrix of zeros. If the parameters are infeasible for a nearly balanced concurrence matrix, the function returns the parameter values.