how to down sample a vector?

Question

fariba amini 2016-4-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/278647-how-to-down-sample-a-vector

评论： Max Murphy 2017-9-10

采纳的回答： Star Strider

I have a vector which contain 60 elements. I want to down sample it to have 54 elements.how can I do this?

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Max Murphy 2017-9-10

I am going to try using downsample: https://au.mathworks.com/help/signal/ref/downsample.html

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Answer 1

Star Strider 2016-4-12

4
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/278647-how-to-down-sample-a-vector#answer_217592

在 MATLAB Online 中打开

There are several ways, depending on what your vector is.

This approach is likely the simplest, and used interp1:

V = randi(99, 1, 60);                       % Vector
idx = 1:60;                                 % Index
idxq = linspace(min(idx), max(idx), 54);    % Interpolation Vector
Vi = interp1(idx, V, idxq, 'linear');       % Downsampled Vector
figure(1)
plot(idx, V, '-r')
hold on
plot(idxq, Vi, 'bp')
hold off
grid
legend('Original Vector', 'Downsampled Vector')