Definte Integration of a Received Sequence

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S. David
S. David 2014-6-4
编辑： S. David 2014-6-4
Hello all,
I have the sequence v of length K-by-1. I want to do integration of v over nn*nsamp to (nn+1)*nsamp for nn=0, ..., N-1 and K=nsamp*N. I did this in MATLAB as following:
y=zeros(N,1);
for nn=0:N-1
y(nn)=sum(v(nn*nsamp:(n+1)*nsamp))
end
Is this right?
  2 个评论
Mahdi
Mahdi 2014-6-4
Unlike some other programming languages, the index for the first element in a matrix/vector is 1 in MATLAB. So for example, if A=[5 6 7], then A(1) gives 5. While A(0) gives an error. So in your case, you want to define nn from 1 to N-1:
for nn=0:N-1
You might also want to look into the trapz built-in function to integrate. What is the range of x-values you're integrating over?
S. David
S. David 2014-6-4
编辑：S. David 2014-6-4
Yes you are right, I should have written
...
y(nn+1)=sum(v(nn*nsamp+1:(n+1)*nsamp))
...
Actually, v corresponds to the continuous time signal v(t) where
t=0:Ta:(K-1)*Ta
I want to do the integration:
yn=int_{n*Ts}^{(nn+1)*Ts} v(t) dt % n=0,...,N-1
where Ta=Ts/nsamp.

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