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How to set x > 0, at 2nd order polynomial using polyfit.

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Nurul Hazira
Nurul Hazira 2021-5-6
评论： Nurul Hazira 2021-5-6
Hi I need help, I have imported a txt file into my matlab and have set the x and y value, then I got stuck to create the line on graph at x > 0. Below is my normal code without set x > 0.
p2 = polyfit(x,y,2);
f = polyval(p2,x);
plot(x,f,'-')

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KSSV
KSSV 2021-5-6
idx = x > 0 ;
x = x(idx);
y = y(idx) ;
p2 = polyfit(x,y,2);
f = polyval(p2,x);
plot(x,f,'-')

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