Linear_Rand_Comb_Fi​xed_Sum

A random integer row vector of specified length, elements are bounded by lower and upper limits, while elements add up a target value

This function generates a random integer row vector of specified length, where each element
is bounded by lower limit and upper limit, while adding up to a fixed sum.
% m - The specified target sum
% n - The length of desired row vector (i.e. the number of elements)
% ul - the upper limit of the values permitted in the desired vector
% ll - the lower limit of the values permitted in the desired vector