README.md
In StanHeaders: C++ Header Files for Stan

IDAS

Radu Serban, Cosmin Petra, Alan C. Hindmarsh, Cody J. Balos, David J. Gardner, and Carol S. Woodward, Center for Applied Scientific Computing, LLNL

Daniel R. Reynolds, Department of Mathematics, Southern Methodist University

IDAS is a package for the solution of differential-algebraic equation (DAE) systems

F(t,y,y',p) = 0, y(t0) = y0(p), y'(t0) = y0'(p)

with sensitivity analysis capabilities (both forward and adjoint modes). The integration methods used in IDAS are variable-order, variable-coefficient BDF (Backward Differentiation Formula) methods in fixed-leading-coefficient form.

IDAS is part of the SUNDIALS Suite of Nonlinear and Differential/Algebraic equation Solvers which consists of ARKode, CVODE, CVODES, IDA, IDAS and KINSOL. It is written in ANSI standard C and can be used in a variety of computing environments including serial, shared memory, distributed memory, and accelerator-based (e.g., GPU) systems. This flexibility is obtained from a modular design that leverages the shared vector, matrix, linear solver, and nonlinear solver APIs used across SUNDIALS packages.

See the IDAS User Guide and IDAS Examples document for more information about IDAS usage and the provided example programs respectively.

For installation instructions see the INSTALL_GUIDE or the "Installation Procedure" chapter in the IDAS User Guide.

Information on recent changes to IDAS can be found in the "Introduction" chapter of the IDAS User Guide and a complete release history is available in the "SUNDIALS Release History" appendix of the IDAS User Guide.

R. Serban, C. Petra, A. C. Hindmarsh, C. J. Balos, D. J. Gardner, D. R. Reynolds and C. S. Woodward, "User Documentation for IDAS v4.6.1," LLNL technical report UCRL-SM-234051, Dec 2020.
R. Serban and A.C. Hindmarsh, "Example Programs for IDAS v4.6.1," LLNL technical report LLNL-TR-437091, Dec 2020.
A. C. Hindmarsh, P. N. Brown, K. E. Grant, S. L. Lee, R. Serban, D. E. Shumaker, and C. S. Woodward, "SUNDIALS, Suite of Nonlinear and Differential/Algebraic Equation Solvers," ACM Trans. Math. Softw., 31(3), pp. 363-396, 2005.