Algorithm 658: ODESSA–an ordinary differential equation solver with explicit simultaneous sensitivity analysis

ODESSA is a package of FORTRAN routines for simultaneous solution of ordinary differential equations and the associated first-order parametric sensitivity equations, yielding the ODE solution vector <italic>y</italic>&barbelow;(<italic>t</italic>) and the first-order sensitivity coefficients with respect to equation parameters <italic>p</italic>&barbelow;, &sgr;<italic>y</italic>&barbelow;(<italic>t</italic>)/&sgr;<italic>p</italic>&barbelow;. ODESSA is a modification of the widely disseminated initial-value solver LSODE, and retains many of the same operational features. Standard program usage and optional capabilities, installation, and verification considerations are addressed herein.