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I wanted to write the expression given by:

enter image description here

In this calculate_dk and calculate_T are functions having input arguments ii and jj. I wanted to maximize this equation with respect to theeta variable. But, I am unable to form required expression for this purpose. I tried using symsum function 

syms ii jj
F = symsum(symsum(nchoosek(15,ii-1)*nchoosek(15,jj-1)*exp(theeta*calculate_dk(ii-1,jj-1) + sigmaa*calculate_T(ii-1,jj-1)), jj, 1, 16),ii,1,16);

But its giving the error

Error using mupadmex Error in MuPAD command: An arithmetical expression is expected. [exp] Error in sym/privUnaryOp (line 845)
Csym = mupadmex(op,args{1}.s,varargin{:});

Error in sym/exp (line 6)
Y = privUnaryOp(X, 'symobj::map', 'exp');

Error in Acuna_model_funct (line 24)
F = symsum(symsum(nchoosek(15,ii-1) * nchoosek(15,jj-1) * exp(theeta * calculate_dk(ii-1,jj-1)+ sigmaa * calculate_T(ii-1,jj-1)), jj, 1, 16),ii,1,16);

Please help me to form an equation so that i can optimize it (maximize it with respect to theeta).

Mikhail_Sam
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Vikrant Karale
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  • Make your expression runnable. Is the question about "optimization" (no idea what that means in this context) or about the error? Provide the *entire* error message. – horchler Oct 28 '14 at 14:42
  • I just want the valid expression to be returned in F, so that i can optimize it with respect to theeta – Vikrant Karale Oct 28 '14 at 15:04

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