poly4root computes the (real-valued) roots of a polynomial of fourth degree,
be applied to several polynomials of fourh degree at once by assuming that each row the input matrix contains the
coefficients for one of the polynomials.
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a numeric vector of length five specifying the coefficients of the polynomial
a numeric matrix with five columns in which each row contains the five coefficients of a polynomial of fourth degree.
poly4root, a vector containing the real-valued roots of the polynomial. For
a matrix with four columns in which each row contains the real-valued roots of the corresponding polynomial. If
a polynomial has less than four real-valued roots, the remaining entries in the corresponding row are set to
Holger Schwender, email@example.com
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