help with quadratic function graph
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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
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
2020-4-16
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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