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compan
Companion matrix
Syntax
A = compan(u)
Description
A = compan(u) returns the
corresponding companion matrix whose first row is -u(2:n)/u(1),
where u is a vector of polynomial coefficients.
The eigenvalues of compan(u) are the roots of the
polynomial.
Examples
Companion Matrix for Polynomial
Compute the companion matrix corresponding to the polynomial 
.
u = [1 0 -7 6]; A = compan(u)
A = 3×3
0 7 -6
1 0 0
0 1 0
The eigenvalues of A are the polynomial roots.
eig(A)
ans = 3×1
-3.0000
2.0000
1.0000
Extended Capabilities
Introduced before R2006a
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