Certification of Algorithm 734: A Fortran 90 code for unconstrained nonlinear minimization

A Fortran 90 Code for Unconstrained Nonlinear Minimization (ACM Trans. Math. Softw. 20, 3 (Sept. 1994), pages 354-372; CALGO Supplement 131) was ported to a number of compiler-platform combinations. The necessary changes to the code are given along with some comparative timings