finding the error between two curves from a fig
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I have a fig, the onee in attaced (example).
Considering the green one the true value, how can I evaluete the error of the second?
P.S.
I have Matlab 2014b
采纳的回答
Takumi
2020-7-19
I used the findall function to find out what was plotted.
I noticed that some of the lines containing the NaN values were plotted as nonsense.
The lines you're trying to compare are probably h(2) and h(6).
In addition, the blue line contains NaN values that need to be removed.
Finally, we need to align the number of elements to compute the error, so we interpolate.
% get current axes
ax = gca;
% find object
h = findall(ax);
% get Y data of green and blue lines
GreenLineX = h(2).XData;
GreenLineY = h(2).YData;
BlueLineX = h(6).XData;
BlueLineY = h(6).YData;
% eliminate NaN
BlueLineX = rmmissing(BlueLineX);
BlueLineY = rmmissing(BlueLineY);
% interpolation
GreenLineY_interp = interp1(GreenLineX,GreenLineY,BlueLineX,'spline');
% MSE
MeanSquaredError = mean((GreenLineY_interp - BlueLineY).^2);
figure
plot(GreenLineX,GreenLineY,'-g');
hold on
plot(BlueLineX,BlueLineY,'-b');
6 个评论
Paul Rogers
2020-7-19
Takumi
2020-7-19
% get current axes
ax = gca;
% find object
h = findall(ax);
% get Y data of green and blue lines
GreenLineX = h(2).XData;
GreenLineY = h(2).YData;
BlueLineX = h(6).XData;
BlueLineY = h(6).YData;
% eliminate NaN
BlueLineX= BlueLineX(~isnan(BlueLineX));
BlueLineY= BlueLineY(~isnan(BlueLineY));
% BlueLineX = rmmissing(BlueLineX);
% BlueLineY = rmmissing(BlueLineY);
% interpolation
GreenLineY_interp = interp1(GreenLineX,GreenLineY,BlueLineX,'spline');
% MSE
MeanSquaredError = mean((GreenLineY_interp - BlueLineY).^2);
figure
plot(GreenLineX,GreenLineY,'-g');
hold on
plot(BlueLineX,BlueLineY,'-b');
Paul Rogers
2020-7-19
Takumi
2020-7-19
Really? Your version is 2014b right?
Takumi
2020-7-19
I have installed MATLAB version 2014b and it worked fine.
Paul Rogers
2020-7-19
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