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
MATLAB: Help with quadratic function graph
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If you don't have an equation of your dataset, then it will be simpler to use the following methods
spline()
rng(0)x = 1:10; % x-values
y = rand(size(x)); % random y-values
xv = linspace(min(x), max(x), 100); % more points on x-axis to make a smooth curve
yv = spline(x, y, xv); % interpolation using spline
plot(x, y, 'ro-', xv, yv, 'b-')
pchip()
rng(0)x = 1:10; % x-valuesy = rand(size(x)); % random y-valuesxv = linspace(min(x), max(x), 100); % more points on x-axis to make a smooth curveyv = pchip(x, y, xv); % interpolation using pchip
plot(x, y, 'ro-', xv, yv, 'b-')
makima()
rng(0)x = 1:10; % x-valuesy = rand(size(x)); % random y-valuesxv = linspace(min(x), max(x), 100); % more points on x-axis to make a smooth curveyv = makima(x, y, xv); % interpolation using makima
plot(x, y, 'ro-', xv, yv, 'b-')
You can use fittype to specify the type of function you want to fit
x = linspace(0, 2, 100);y = 2*x.^2 + 3*x + 4;ft1 = fittype('a*x^2+b*x+c');fit1 = fit(x',y',ft1);ft2 = fittype('a*x^2+2.5*x+c'); % <--- fix the coefficient of x
fit2 = fit(x',y',ft2);
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