Creating both series and for loop
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I have a precipitation values P= [0.5 1 1.5 1] and U=[10 100 200 150 100 50] and I want to create a series like below in matlab.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/190277/image.png)
I write a command like this but I can't run it: Let's say M=4 and N=9
for n=1:9;
syms m;
Q(n)=symsum(P(m)*U(n-m+1),m,1,4);
end
But it gives me the following error.
rror using sym/subsindex (line 732) Invalid indexing or function definition. When defining a function, ensure that the arguments are symbolic variables and the body of the function is a SYM expression. When indexing, the input must be numeric, logical, or ':'.
How can I solve this problem ?
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Accepted Answer
Ameer Hamza
on 3 May 2018
Edited: Ameer Hamza
on 3 May 2018
You are trying to calculate the convolution of P and U and there is a built-in function in MATLAB for this
Q = conv(P, U);
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