Description Usage Arguments Value Author(s) Examples

While `poly4root`

computes the (real-valued) roots of a polynomial of fourth degree, `poly4rootMat`

can
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.

1 2 3 | ```
poly4root(a)
poly4rootMat(amat)
``` |

`a` |
a numeric vector of length five specifying the coefficients of the polynomial |

`amat` |
a numeric matrix with five columns in which each row contains the five coefficients of a polynomial of fourth degree. |

For `poly4root`

, a vector containing the real-valued roots of the polynomial. For `poly4rootMat`

,
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 `NA`

.

Holger Schwender, holger.schwender@udo.edu

1 2 3 4 |

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