How do I calculate the coefficients C in this function while P and T are given?

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Zifeng Qiu
Zifeng Qiu 2020-7-19
回答： Rafael Hernandez-Walls 2020-7-19
T=[4:4:24]';
P=[1e-4;2.5e-4;6e-4;1e-3;1.6e-3;2.25e-3];
plot(T,P)
%find C with the given vectors

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采纳的回答

Rafael Hernandez-Walls
You can use this equations:
T=[4:4:24]';
P=[1e-4;2.5e-4;6e-4;1e-3;1.6e-3;2.25e-3];
plot(T,P,'o')
n=length(P);
A=[ones(n,1) T T.^2];
C=inv(A'*A)*A'*P;
P2=C(1)+C(2)*T+C(3)*T.^2;
hold on
plot(T,P2)

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