Help with function/script polynom

2014 9 2
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更新时间：2014 9 4
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I'm supposed to make 3 different codes on how to getCoefficient, getplot and getPolynom in matlab. The first line in the getCoeff code is:
function [coeff] = getCoeff(Xp,Yp)
and I know if I've done it right all I should be able to type in
Xp=[1,4,5,6];
Yp=[5,14,21,70];
coeff=getCoeff(Xp,Yp)
it shouldnt matter what degree the polynom is in, the general look is: p(x)= an*x.^n + an-1*x.^n-1+...+a2*x.^2+a1x+a0
how do I put this in a function?

3 个评论
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John D'Errico
John D'Errico 2014-9-2
Do you know what polyfit is?
Sverre
Sverre 2014-9-4
I typed in:
>> Xp = [1,4,5,6];
>> Yp = [5,14,21,70];
>> p = polyfit(Xp,Yp)
Error using polyfit (line 59) Not enough input arguments.
Don't know why it won't work, I'm new to matlab.. all help is appreciated
Sverre
Sverre 2014-9-4
ok I think I figured it out, isntead of typing in
p = polyfit(Xp,Yp)
I typed in:
p = polyfit(Xp,Yp,3)
so I could get the degree the polynom is in.

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Sverre
Sverre
2014-9-2

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Sverre
Sverre
2014-9-4

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