it's the command for dynare.
"The steady option accepts a solve_algo option for choosing the nonlinear solver for the steady state. This option can take the following values:
solve_algo=0: uses fsolve
solve_algo=1: uses Dynare's own nonlinear equation solver
solve_algo=2: splits the model into recursive blocks and solves each block in turn
solve_algo=3: Chris Sims' solver
solve_algo=4: similar to value 2, except that it deals differently with nearly singular Jacobian
solve_algo=5: Newton algorithm with a sparse Gaussian elimination (SPE)
solve_algo=6: Newton algorithm with a sparse LU solver at each iteration
solve_algo=7: Newton algorithm with a Generalized Minimal Residual (GMRES) solver at each iteration
solve_algo=8: Newton algorithm with a Stabilized Bi-Conjugate Gradient (BICGSTAB) solver at each iteration "
http://www.dynare.org/DynareWiki/FastDe ... omputation