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i want write the next function by matlab ?

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mohammed elmenshawy
mohammed elmenshawy 2016-12-22
回答： Walter Roberson 2016-12-22
  2 个评论
John D'Errico
John D'Errico 2016-12-22
It is time for you to learn to use loops. Here a for loop is simple and reasonable.
mohammed elmenshawy
mohammed elmenshawy 2016-12-22
i write the following and displayed the error
. what to do ?

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回答（1 个）

Walter Roberson
Walter Roberson 2016-12-22
You syms Z but what is z (lower-case) ? Is it a function or is it a vector?
It is not possible to use a symbolic expression to index an array. If you have a finite vector to sum symbolically, then construct all elements of the vector and then sum() them. Constructing the elements of the vector is sometimes possible using vectorization.
t = 4:n;
L = sum((z(t) - null1 .* z(t-1) - null2 .* z(t-2) + theta .* alpha(t-1)).^2) ./ (2 .* sigma.^2);

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