- The fsolve function in Octave, or the Matlab Optimization Toolbox, attempts to solve unconstrained, overdetermined, nonlinear systems of equations.
- The Octave function sqp handles constrained nonlinear optimization.
- The Octave optim package includes many additional functions such as leasqr for performing Levenberg-Marquardt nonlinear regression. (Say, e.g., which leasqr and explore its directory.)
- The Matlab Optimization Toolbox similarly contains many functions for optimization.
Second-Order Cone Problems