If I have three graphs and I want to place them over one another so that their mean values align, and then want to create a trend line among those graphs how would I do this?
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Keon Walters
il 13 Lug 2018
Commentato: Keon Walters
il 16 Lug 2018
%example
x=[1:0.03:500];
y=x^4;
i=[100:0.01:600];
y2=x^2+30;
plot(x,y,i,y2);
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Image Analyst
il 14 Lug 2018
Try this:
x1=[1:0.03:500];
y1 = x1.^4;
x2 = [100:0.01:600];
y2 = x2.^2+30;
plot(x1,y1, 'r-', 'LineWidth', 2);
hold on;
plot(x2,y2, 'b-', 'LineWidth', 2);
grid on;
xAll = [x1, x2];
yAll = [y1, y2];
[coefficients, S, mu] = polyfit(xAll, yAll, 1)
numPoints = max([length(x1), length(x2)])
fittedX = linspace(min(xAll), max(xAll), numPoints);
fittedY = polyval(coefficients, fittedX, S, mu);
plot(fittedX, fittedY, 'g-', 'LineWidth', 2);
legend('y1', 'y2', 'linear fit y', 'location', 'north');
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/191928/image.png)
Is that what you're thinking of? Note that because you have more of the flatter curve points, it's pulling down the "average" line curve. If you don't want that you can use interp1 to resample to have them both have the same number of points and same starting and ending x values.
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