Question
I was wondering if there was a way to calculate interpolation error when using INTERP in the Signal Processing Toolbox.
Expert Answer
John Michell
PhD Expert
Answered Aug 17, 2026
One way to find the interpolation error given the following:
t = 0:0.001:1; % Time vector x = sin(2*pi*30*t) + sin(2*pi*60*t); r = 4; y = interp(x,r);
is to use:
e = x - y(1:r:end);
"e" is the difference between the original data, "x", and the interpolated data, "y", at the original discrete times.
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