multiplication of functions integration problem

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fima v
fima v 2020-5-7
编辑： fima v 2020-5-11
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);

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ChrizzzlP
ChrizzzlP 2020-5-7
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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fima v
fima v 2020-5-7
编辑：fima v 2020-5-11
Hello Steven when i did the "fun" ONLY integration,fun_integral results in 43
But when i integrate the element wise multiplication you suggested( which is adding a filter and it should reduce the integral result)instead i get NAN in the mult_integral.
it said "Warning: Infinite or Not-a-Number value encountered"
Why my integral exploded?
What could be done?
Thanks
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);
fima v
fima v 2020-5-7
编辑：fima v 2020-5-7
Hello I was able to integrate the Purple plot over the range and it gave me 43
Why when i integrate the smaller green plot My integral explodes?
Thanks.

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