how to create symbolic function?

2017 10 30
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I need to transform the following function to the symbolic form to evaluate it with arbitrary precision.
Z(N,Thetas) = prod((1 - exp(-(N:-1:2).*Thetas))./(1 - exp(-Thetas)),2)
where Thetas is matrix M x N-1 of the positive real numbers. So the expected result is vector Z (M x 1). I am not able to rewrite function Z to symbolic form and than evaluated it by vpa() command.
Any idea how to effectively solve it?

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Michal
Michal 2017-10-30
编辑：Michal 2017-10-30

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function Z=symZ(N,Thetas,Ndigit)
Thetas = sym(Thetas);
Zsym = prod((1 - exp(-(N:-1:2).*Thetas))./(1 - exp(-Thetas)),2);
Z = vpa(Zsym,Ndigit);
end

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how evaluate an symbolic expresion?

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