# CTAN Update: polexpr

There are two main changes: - polynomials are also made known as functions to the \xintfloatexpr parser. This is indispensible for numerical algorithms (such as finding roots by Newton's method or Regula Falsi) as exact computations quickly give very big fractions. - there was a breaking change for \PolToExpr. It now outputs in descending powers; use \PolToExpr* for ascending powers. See README.md for more. The documentation (in polexpr.html) was extended and fully revised.

The package’s Catalogue entry can be viewed at https://ctan.org/pkg/polexpr (although, at the moment, the data displayed on this page are not up to date due to a bug of the website. Sorry for the inconvenience!)) The package’s files themselves can be inspected at http://mirror.ctan.org/macros/latex/contrib/polexpr/

Thanks for the upload. For the CTAN Team Petra Rübe-Pugliese

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## polexpr – A parser for polynomial expressions

The package provides a parser `\poldef` of algebraic polynomial
expressions. As it is based on xintexpr,
the coefficients are allowed to be arbitrary rational numbers.

Once defined, a polynomial is usable by its name either as a numerical
function in `\xintexpr`/`\xinteval`, or for additional
polynomial definitions, or as argument to the package macros.
The localization of real roots to arbitrary precision as well as the
determination of all rational roots is implemented via such macros.

Since release 0.8, polexpr extends the xintexpr
syntax to recognize polynomials as a new variable type (and not only as functions).
Functionality which previously was implemented via macros such as the
computation of a greatest common divisor is now available directly in
`\xintexpr`, `\xinteval` or `\poldef`
via infix or functional syntax.

Package | polexpr |

Version | 0.8.7a 2022-05-19 |

Copyright | 2018–2022 Jean-François Burnol |

Maintainer | Jean-François Burnol |