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Best Fit Line for Parabola

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Daniella Chait
Daniella Chait 2022-9-22
编辑： Torsten 2022-9-22
I am trying to make a best fit line for a negative parabola, but when I use polyfit(x,y,2) and plot it I get the following image. Any tips?
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Torsten
Torsten 2022-9-22
编辑：Torsten 2022-9-22
You try to fit a parabola to only one (x,y) point.
If this is what you want, your curve is correct since it passes through the point with 0 magnets.

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回答（1 个）

Star Strider
Star Strider 2022-9-22
Ran in:
Try something like this —
x = [0; 0.019; 0.036];
y = [0.015; 0.25; 0.05];
p = polyfit(x, y, 2)
p = 1×3
-670.3646 25.1053 0.0150
xv = linspace(min(x), max(x));
yv = polyval(p,xv);
figure
plot(x, y, 'o')
hold on
plot(xv, yv, '-r')
hold off
xlabel('x')
ylabel('y')
.

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