# Writing summation inside function handle

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Saurabh Madankar on 10 Nov 2021
Answered: Aneela on 19 Feb 2024
Hey,
I have this term
u = @(x) c(1)*f(3*(x-t(1)))+c(2)*f(3*(x-t(2)))+c(3)*f(3*(x-t(3)))+c(4)*f(3*(x-t(4)))+...
c(5)*f(3*(x-t(5)))+c(6)*f(3*(x-t(6)));
inside a function I have written. What I want is to write these six terms here using summation. So how should I go about it?
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Saurabh Madankar on 10 Nov 2021
Here f is also a function handle, a function of x (which I have defined as a linearly spaced vector) which returns a scalar value.
Saurabh Madankar on 10 Nov 2021
And yes I can't pass a vector of elements to f. It takes only one element at a time.

Aneela on 19 Feb 2024
You can make use of the “sum” and “arrayfun” MATLAB functions to write these 6 terms using summation.
u = @(x) sum(arrayfun(@(k) c(k) * f (3 * (x - t(k))), 1:6));
Refer to the following links for further details on “sum” and “arrayfun“ functions in MATLAB.