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How to find slope of this line

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jaad shahout
jaad shahout 2019-5-3
回答： Jos (10584) 2019-5-3
I'm trying to find the slope of this linear line but I can't use polyfit because the vectors aren't the same size.
x = [0.0914;0.195;0.292];
y = [-2.89,-3.55,-2.88,-3.10,-3.09,-3.09,-3.28,-3.35;-7.65,-7.75,-7.43,-7.62,-7.60,-7.66,-7.32,-7.68;-11.2,-11.5,-11.6,-11.45,-11.5,-11.5,-11.5,-11.6];
plot(x,y,'o')
grid on
xlabel('Distance-x (m)')
ylabel('Episilon(bottom)/Pj 1/N')
title('Thick Cantilever Negative')
polyfit(x,y,1)

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采纳的回答

Jos (10584)
Jos (10584) 2019-5-3
You can create a complete list of x,y pairs by expanding x to the size of y. Looking at your code, I think a single element of x belongs to a row of y, so:
xx = repmat(x(:), 1, size(y,2))
polyfit(xx, y, 1)

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