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

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Jucimar Carpe 2017-9-9

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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!

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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 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 2017-9-9

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https://ww2.mathworks.cn/matlabcentral/answers/355890-how-to-do-a-convolution-for-n-samples-starting-from-n-0#answer_280937

在 MATLAB Online 中打开

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 2017-9-9

在 MATLAB Online 中打开

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.

Jucimar Carpe 2017-9-10

Thats nice!!!, thank you a lot!

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