r-cran-nleqslv binary package in Ubuntu Focal i386

 This R package solves a system of nonlinear equations using a Broyden or a
 Newton method with a choice of global strategies such as line search and trust
 region. There are options for using a numerical or user supplied Jacobian, for
 specifying a banded numerical Jacobian and for allowing a singular or
 ill-conditioned Jacobian.