How can I find the interpolation error when I use INTERP in the Signal Processing Toolbox?

Holden asked: 2021-03-22 matlab , signal , signal processing , interp

Learn how to calculate interpolation error using the interp function in MATLABs Signal Processing Toolbox. Get accurate results & improve your signal processin

Expert Answer

John Michell answered . 2025-07-29 20:41:05

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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