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help with quadratic function graph

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random1072
random1072 2020-4-16
评论： Ameer Hamza 2020-4-16
need help making a quadratic growth graph where the maximum of 22.0 is at center with 0.55 on the ends. The x range is from 1 - 15 so need 0.55 at 1 and 0.55 at 15 with 22 at 8. please help

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Ameer Hamza
Ameer Hamza 2020-4-16
Try this
x = [1 8 15];
y = [0.55 22 0.55];
ft = fittype('a*x^2+b*x+c');
fit_quad = fit(x',y',ft);
xv = linspace(x(1), x(end), 100);
yv = fit_quad(xv);
plot(xv,yv);
xlim([x(1) x(end)]);
ylim([0.55 22]);
  2 个评论
random1072
random1072 2020-4-16
It did work thank you, only thing I’m getting a warning for is that it says “warning: start point not provided, choosing random start point”
Ameer Hamza
Ameer Hamza 2020-4-16
This is not an issue. This is just a warning that the function is choosing a random initial point for the optimization algorithm. You can suppress this warning by providing your own starting point
fit_quad = fit(x',y',ft, 'StartPoint', rand(1,3));

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