How do I evaluate a function that contain an array index inside a sum?
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I want to evaluate this function and save the result in an array in MATLAB
Where A and B are arrays, and N and P are constants. For example A = [1,2,3,4], B = [1,2,3], P = 6, and N = 4.
Also, I want to save the output of f(x) and its corresponding x value.
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Walter Roberson
2021-10-6
编辑：Walter Roberson
2021-10-19
Calculate definite vector values and sum()
k = (1 : N-1) .';
f = @(x) A0/2 + sum(A(k) .* cos(2*pi.*k.*x./P) + B(k) .* sin(2*pi*.k.*x./P),1) + A(N).*cos(2*pi.*N.*x/P)/2
For example A = [1,2,3,4], B = [1,2,3], P = 6, and N = 12
N cannot be greater than one less than length(A) or length(B).
Also, unless you store 
in a separate variable like I used here, then you would need to make adjustments to the code to deal with the question of whether you are using 0-based indexing or 1-based indexing.
in a separate variable like I used here, then you would need to make adjustments to the code to deal with the question of whether you are using 0-based indexing or 1-based indexing. Note: this version of the code is vectorized, provided that x is a row vector.
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