How to do a convolution for n samples starting from n=0 ?

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Jucimar Carpe
Jucimar Carpe 2017-9-9
评论： Jose Marques 2017-9-10
Hi guys,
My question can be a little bit stupid but im trying to figure it out why the answer of my convolution isn't working. The results should appear in the n=0 and this is not what im getting.
Can someone tell me how can i solve it?
The sequence is:
x=[-1 0 1]
h= [0.5 0.25 0.125] ->(version not flipped by the way)
i should get for n=0 ==> -0.5
Cheers!
  2 个评论
Image Analyst
Image Analyst 2017-9-10
编辑：Image Analyst 2017-9-10
If n is the number of samples, as you said, then what does it mean when you say n=0? Zero samples????
Jose Marques
Jose Marques 2017-9-10
n is not the number of samples. In discrete convolution, n is a array index.

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采纳的回答

Jose Marques
Jose Marques 2017-9-9
Hello Jucimar. You can try this:
x = [-1 0 1];
h = [0.5 0.25 0 0.125];
w = conv(x,h)
w =
Columns 1 through 5
-0.5000 -0.2500 0.5000 0.1250 0
Column 6
0.1250
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Jose Marques
Jose Marques 2017-9-9
You can generate a array n:
x = [-1 0 1];
h = [0.5 0.25 0 0.125];
n = 0:5;
w = conv(x,h)
plot(n,w)
Try this.

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