How can I find the average of several lines whose datasets are different lengths?

I suggest you resample each curve with interp1() so that all your curves are using a common set of x values. Then simply add them up and divide by the number. Something like (untested):

numPoints = 1000; % Whatever resolution you want.
xCommon = linspace(0, 100, numPoints);
ySum = zeros(1, numPoints);
for k = 1 : numberOfCurves
    % Somehow get this particular set of x and y
    thisx = 
    thisy = 
    % Interpolate y so that it's using a common x axis.
    yCommon = interp1(thisx, thisy, xCommon);
    % Add it in to the other curves.
    ySum = ySum + yCommon;
end
% Divide the sum by the number of curves to get the average curve.
yAverage = ySum / numberOfCurves;

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Trevor D Clark 2021-9-16

This method worked really well, thanks for your help!

请先登录，再进行评论。

Answer 2

the cyclist 2021-9-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1454804-how-can-i-find-the-average-of-several-lines-whose-datasets-are-different-lengths#answer_788994

One possible solution would be to interpolate (e.g. with spline function) using the interp1 function, to a common grid of points along the x-axis, then take the mean over those points.