Re: calculating the eigen matrix

[Quentin Spencer]

This is from some old code I wrote:

ComplexMatrix R(size,size), V(size,size);
// Assign R to something...
V = EIG(R).eigenvectors();

Note that the data type doesn't have to be ComplexMatrix--it could also 
be just Matrix. I only needed the eigenvectors in this particular 
application. If you wanted both eigenvalues and eigenvectors, a better 
way would probably be something like this:

EIG EVD;
Matrix A,B;
ColumnVector c;
// Assign A to something...
EVD=EIG(A);
B=EVD.eigenvectors();
c=EVD.eigenvalues();

This code is untested--just based on what I remember from doing this 
sort of thing in the past. I hope this helps.

Regards,
Quentin Spencer



Tapesh wrote:

> Hi,
>
>  
>
> I am writing an application in C/C++ and want to use Octave library to 
> calculate the eigen matrix and eigen-values.
>
>  
>
> I am able to compile octave successfully and to write a sample C++ 
> programme.
>
>  
>
> Can someone provide a sample code to calculate eigen vectors?
>
>  
>
>  
>
> Thanks in Advance,
>
> Tapesh Kr. Agarwal
>
>  



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