What to change in code?
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Hello Experts,
Given the following code:
How to transform it to work with the full polynomial, not from a(1).
I really need someone to help me with this issue urgently.
Thanks in advance!
3 个评论
bym
2011-10-10
whats wrong with answers here? http://www.mathworks.com/matlabcentral/answers/17931-bairstow-method-to-find-polynomial-roots-matlab-code-problem
回答(1 个)
Wayne King
2011-10-10
Steve, I have the same question proecsm asks, what's wrong with the answer Walter and I gave you in your earlier post? If you want the roots of:
p(x) = 2*x^2+2*x+1
You can do that with
roots([2 2 1])
or using your function, simply divide through by 2 and don't include the leading 1.
[rts,it]=bairstow([1 1/2],2,1e-3);
As I read Walter's post that is exactly what he clearly explained to you. And I certainly tried to explain very much the same thing.
It seems to me that you're much better off learning to provide the correct input to the funtion you have instead of trying to modify it to accept the input you want to give it.
1 个评论
Walter Roberson
2011-10-10
Yup, exactly.
if a(1) ~= 1; a = a ./ a(1); end
a = a(2:end);
The test for 1 is merely an optimization. You could just use
a = a(2:end) ./ a(1);
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