How to solve for the coefficients of a polynomial equation?

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Ling Fang Toh
Ling Fang Toh 2013-1-10
评论： Walter Roberson 2018-11-9
I have a formula here:
T=A+BI+CI^2+DI^3
where T and I are known and varies, and A,B,C,D are my unknown constants...
With 4 unknowns, I would need to provide 4 equations.
How may I write these in matlab in order to solve for A,B,C and D?

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Azzi Abdelmalek
Azzi Abdelmalek 2013-1-10
编辑：Azzi Abdelmalek 2013-1-10
I=1;T=3
% A*y=b your equation with y=[A;B;C;D] are unknown variables
A=[1 1 I^2 I^3 % your first equation T=A+BI+CI^2+DI^3
1 3 4 5 % your second equation is A+3B+4C+5D=1
4 5 1 2
0 4 1 7]
b=[T;1;2;3]
y=A\b

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