MATLAB: Reduce data points from 200 to 108

datafilterMATLAB

I have a data series with 200 data points and I need to compress this information to 108 data points. I don't think I can use a moving average filter as the window wouldn't be an integer so is there a way in MATLAB to do this?

Best Answer

I have no idea what your data are or what you want to do with them, other than reduce the number of them.

Interpolating them to a shorter independent variable vector may be an option. See if the interp1 function can do what you want. The linspace function can be helpful in providing the new independent variable vector.

Related Solutions

MATLAB: Upsampling the data using interpolation gives NaN values.

Use the 'extrap' argument in interp1.

Example —

D = load('x.mat');
x = D.x;
v = 1:numel(x);
ve = 1:2225570;
x_extended = interp1(v, x, ve, 'linear','extrap');

This is dangerous, because you have no idea what ‘x’ actually would be beyond its current definition. I would definitely avoid that.

However you can completely avoid all those problems if you simply want more points in ‘x’:

vr = linspace(min(v), max(v), 2225570);
x_resampled = interp1(v, x, vr);

Experiment to get the result you want.

MATLAB: Expand length of matrix to fixed value

t = interp1( 1:108, t, linspace(1, 108, 200 ) );

would be one way to do it.

Best Answer

Related Solutions

MATLAB: Upsampling the data using interpolation gives NaN values.

MATLAB: Expand length of matrix to fixed value

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