MATLAB: Multiplication of functions integration problem

integrationinterpolationmultiplication

Hello,i have two functions "fun" and "coef_fun"
"coef_fun" was created with interpolation of the attached CSV and it looks like in the photo bellow.
I have integrated fun over some interval ,and i got some numeric result.
When i tried to integrate the multiplication of fun and coeff_fun (in order to see the reduction the the numeric result)
It gives me an error "Undefined operator '*' for input arguments of type 'function_handle'"
i have attached my code.
Where did i go wrong in integrating multiplication of functions?
Thanks.
%Default Dataset_new file
data = load('Default Dataset4.csv');
x = data(:,1);
y = data(:,2);
%plot(x,y);
data_x1=x*0.000001; %transform to micron
[data_k, index] = unique(data_x1);

Best Answer

mult_fun needs to be defined as a function too. simple example below:
fun = @(x)x+3;
coef_fun = @(x) 5*x+9;
multiplication_func = @(x) fun(x)*coef_fun(x);
multiplication_func(2)
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