averaging two curves of different points

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Samuel 2014-3-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/123022-averaging-two-curves-of-different-points

回答： John D'Errico 2014-3-25

I right now have two sets of xy data, constituting 2 curves. They are similar in plot shape, but different in number of points(e.g., plot one is a 1200 by 2, plot two is a 3000 by 2). How would I go about getting an average curve of it?

Research on this using matlab showed people tried to make use of the interp1 function and/or the curve fitting tool, but I couldn't find a reasonable set of procedure or description to do this exact function.

Any help will be appreciated. thanks in advance.

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Answer 1

John D'Errico 2014-3-25

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https://ww2.mathworks.cn/matlabcentral/answers/123022-averaging-two-curves-of-different-points#answer_130302

Interpolate the first curve to live on the same set of points as the second. Use interp1 to do this. Then average the resulting y values. (I'm not sure what more you need in terms of a description.)

Note that the interpolation introduces errors due to interpolation. There are no errors introduced at the original points of course, because it is interpolation. But between the points...