What does roots/ eig do exactly?
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Thomas Waljor
on 5 Aug 2015
Commented: James Tursa
on 5 Aug 2015
I want to write a programm on Matlab, without using implemented functions. This programm should be similiar to the Matlab function roots. But I am not sure what roots does, is there any possibility to read something like a pseudo-code of roots or eig? Or is it possible to find .m file that fullfills this conditions?
Is roots simply using the QR decomposition with shifts ?
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Sean de Wolski
on 5 Aug 2015
Edited: Sean de Wolski
on 5 Aug 2015
>>edit roots
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James Tursa
on 5 Aug 2015
By looking at the code for roots you have that answer. It constructs a matrix where the characteristic polynomial of that matrix is your polynomial. Then it uses eig to find eigenvalues of that matrix, which will be equal to the roots of the characteristic polynomial.
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