# [Maxima] eigen vectors and eigen values

Chibisi Chima-Okereke chibco at gmail.com
Wed Jun 18 12:52:19 CDT 2008

```Dear all,

I am probably doing something silly and don't realise it but here goes...

I am trying to find the eigen values and eigen vectors of a matrix, but
maxima keeps giving me an error (run on win XP in wxMaxima)

(%i37)E:
matrix([1,-1,0,0,0,0,0],[-1,3,-1,0,-1,0,0],[0,-1,3,-1,0,-1,0],[0,0,-1,3,0,0,-1],[0,
-1,0,0,3,-1,0],[0,0,-1,0,-1,4,-1],[0,0,0,-1,0,-1,4]);

(%o37)
matrix([1,-1,0,0,0,0,0],[-1,3,-1,0,-1,0,0],[0,-1,3,-1,0,-1,0],[0,0,-1,3,0,0,-1],[0,-1,0,0,3,-1,0],[0,0,-1,0,-1,4,-1],[0,0,0,-1,0,-1,4])

(%i38) eigenvalues(E);

solve is unable to find the roots of the characteristic polynomial.

(%o38) []

and for eigenvectors ...

(%i42)eigenvectors(E);

solve is unable to find the roots of the characteristic polynomial.

(%o42) []

I have tried the same problem in R and I get an answer (in the blink of an
eye). Can anyone let me know what the problem is?

Kind Regards

Chibisi
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