maximization of a function with constraint​s--optimiz​ation problem

hello, i heard that MATLAB is very good for all students \
and researchers ....but i am new to this.now i have started to \
learn.i dont know how to solve problems on constrained optimization \
problems in this.i have tried to solve this by using "fmincon" but i \
am not able to solve.the problem which i am struggling to solving is \
described below.i want to maximize the function with four \
constraints.1) the function to be maximized is : 
                  f = -(summation1 (p (i)*ln (p (i)))); 
                where summation1 is from i = 1 to n
                2) the constraints are as follows : 
                i) (SUM1SUM2 (p (i) (j))) - 1 == 0; 
          where here SUM1 is summation1 as mentioned above which is \
i = 1 t0 n
          and SUM2 is j = 1 to n;
          ii) (SUM1SUM2 ((p (i) (j))*D (i)^3)) - 1 == 0; 
      where as mentioned above SUM1 is i = 
       1 to n and SUM2 is j = 
        1 to n.iii) (SUM1SUM2 ((p (i) (j))*D (i)^3*V (j))) - (1 - 
      a) = 0
  where "a" is a constant value
  iv) (SUM1SUM2 ((p (i) (j))*D (i)^3*V (j)^2)) - K = 0
where "K" is a constant value
Here D and V are the input values and can give from 0 to 5 and 0 to 2 \
with equal intervals.So could any one please suggest me how to solve \
this problem.if possible code ..
thanks
hari.B