Enlsip.jl: A Julia optimization package to solve constrained nonlinear least-squares problems

Enlsip.jl is a Julia (Bezanson et al., 2017) package that implements a solver for nonlinear least-squares problems with nonlinear constraints.This type of problem is mathematically formulated as:where the functions ( 1 , … , ), often denoted as the residuals, and constraints ( 1 , … , ℓ ) are two-times differentiable.This package is the Julia version of ENLSIP (Easy Nonlinear Least Squares Inequality Program), an open-source Fortran77 library developed by Lindström & Wedin (1988) 1 .