how to down sample a vector?

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

[Max Murphy]

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

Answer 1

[Star Strider]

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')