Creating both series and for loop

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.

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 ?

Answer 1

[Ameer Hamza]

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);

[Gokhan Kayan]

Thanks Ameer, I tried to write a code but I didn't know that MATLAB has just a short command for this. This is what I exactly want :)

[Ameer Hamza]

You are welcome.