Matlab coding for downsampli​ng........​......

2013 2 24
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How to downsample a sinusodial signal in matlab coding...............

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Wayne King
Wayne King 2013-2-24

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If you have the Signal Processing Toolbox, you can use downsample() to simply downsample without lowpass filtering. Or use decimate() or resample() to first lowpass filter and then downsample.
n = 0:159;
x = cos(pi/4*n);
% downsample by 2 starting with the first value
y = downsample(x,2,0);
% downsample by 2 starting with the second value
y1 = downsample(x,2,1);
You can of course do the above with simple MATLAB commands:
y = x(1:2:end);
y1 = x(2:2:end);
In general, do consider either decimate()or resample() as these afford anti-aliasing through filtering.

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