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5.55.1  Eigenvalues: eigenvals

eigenvals takes as argument a square matrix A of size n.
eigenvals returns the sequence of the n eigenvalues of A.
Remark: If A is exact, Xcas may not be able to find the exact roots of the characteristic polynomial, eigenvals will return approximate eigenvalues of A if the coefficients are numeric or a subset of the eigenvalues if the coefficients are symbolic.
Input:

eigenvals([[4,1,-2],[1,2,-1],[2,1,0]])

Output:

(2,2,2)

Input:

eigenvals([[4,1,0],[1,2,-1],[2,1,0]])

Output:

(0.324869129433,4.21431974338,1.46081112719)

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