MATLAB: Can any one help me in detecting an error in matlab code please

**

    pih=[];
    for im=1:0.1:20
        n=15;
      i=13;
      k=8;
      m=2;
      h=3;
      f=factorial(n)/(factorial(i)*factorial(n-i));
      g=factorial((2^(k-(m*h)))*factorial(i)*factorial((2^(k-(m*h)))-i));
      p=factorial((2^k))/factorial(i)*factorial((2^k)-i);
      j=g/p;
      o=factorial((2^k)-(2^(k-(m*h))))/factorial(n-i)*factorial((2^k) ...
        -(2^(k-(m*h)))-(n-i));
      u=factorial((2^k)-i)/factorial(n-i)*factorial((2^k)-i-(n-i));
      z=o/u;
      pih=f*j*z;
  end
this is the code and this is the error message :
??? Error using ==> factorial at 17
N must be a matrix of non-negative integers.
Error in ==> marwa at 12
    g=factorial((2^(k-(m*h)))*factorial(i)*factorial((2^(k-(m*h)))-i));
??? Error using ==> factorial at 17
N must be a matrix of non-negative integers.
Error in ==> marwa at 12
    g=factorial((2^(k-(m*h)))*factorial(i)*factorial((2^(k-(m*h)))-i));

Best Answer

The error message is telling you what is wrong. In this case the expression within the larger expression for finding g
   factorial((2^(k-(m*h)))-i)
when the values of k, m, h, and i are substituted amounts to
   factorial(-9)
and minus nine is not a value the factorial function can handle, as the error message indicates.
You need to rethink your code and decide what really belongs there.
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