Polynomial with specified roots
Compute the coefficients of a polynomial when the roots are given, or the characteristic polynomial of a matrix.
poly(x)
x |
Real or complex vector, or square matrix. |
If a vector is passed as an argument, then poly((x) is a vector of the
coefficients of the polynomial whose roots are the elements of x.
If an N x N square matrix is given, poly((x)
is the row vector of the coefficients of det (z * diag (N) - x),
which is the characteristic polynomial of x.
A vector of the coefficients of the polynomial in order from highest to lowest polynomial power.
Kurt Hornik.
Conversion to R by Tom Short,
adapted by Geert van Boxtel, G.J.M.vanBoxtel@gmail.com
p <- poly(c(1, -1)) p <- poly(pracma::roots(1:3)) p <- poly(matrix(1:9, 3, 3))
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