How to sum the product between a matrix and 2 vectors
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I need to solve a system of differential equation written as:
For each equation I should solve a summation like:
where K_Br is a matrix previously calculated and n is a vector as the solution of the differential equation system.
For example, for i=3:
I wrote the system of differential equation as:
function ndot = System_ni (t,n)
ndot = zeros(M,1);
ndot(1) = -n(1)*sum(K_Br(1,1:M)*n(1:M));
for i = 2:M
ndot(i) = 1/2*sum(K_Br(1:i-1,i-1:1)*n(i-1:1)*n(1:i-1))-n(i)*sum(K_Br(i,1:M)*n(1:M));
end
end
but summation seems not to work.
Thank you in advance for any help.
3 Comments
VBBV
on 8 Apr 2024 at 4:54
You need two for loops instead of one for such summation to work.
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