How to define a function with a summation

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Rozalia Korycka
Rozalia Korycka 2019-5-30
评论： Sahil 2022-9-18
Hello,
I'm fairly new to matlab so I'm not too familiar with the way all of the functions work. I need to plot a function I have been given :
but I am having trouble defining it. I've tried the following:
syms k x
f = matlabFunction(b0 + symsum(a(k)*sin(k*x) + b(k)*cos(k*x)));
This gives me an error stating "Invalid indexing or function definition. Indexing must follow MATLAB indexing. Function arguments must be symbolic variables, and function body must be sym expression."
Can someone help me out? :)

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采纳的回答

Matt J
Matt J 2019-5-30
编辑：Matt J 2019-5-30
An efficient implementation would be,
a=___;
b=___;
b0=___;
fplot(@(z) myFourier(z,a,b,b0));
function f=myFourier(x,a,b,b0)
n=numel(a);
arg=x(:).*(1:n);
f=b0+sin(arg)*a(:)+cos(arg)*b(:);
f=reshape(f,size(x));
end
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Matt J
Matt J 2019-5-30
I'm baffled by the warnings. The function is vectorized as fplot requires.
Rozalia Korycka
Rozalia Korycka 2019-5-30
That's exactly the opposite of what the warning says hahah but I don't know since I don't even know what is that supposed to mean

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