The ITPACK Software Package

ITPACK, developed at the Center for Numerical Analysis, the University of Texas at Austin, is a collection of subroutines for solving large sparse linear systems by adaptive accelerated iterative algorithms.

NSPCG (for NonSymmetric Preconditioned Conjugate Gradient) is a wide collection of subroutines for solving large sparse linear systems using iterative algorithms. with a selection of many more preconditioners, accelerators, and data formats. It contains all of the ITPACK subroutines.

Please send email to Dr. David R. Kincaid if you have any questions about ITPACK.

Download

ITPACK 2C: Double-precision ITPACK 2C source code

Testing Routine for double-precision ITPACK 2C

ITPACK 2C: Single-precision ITPACK 2C source code

Testing Routine for single-precision ITPACK 2C

ITPACKV 2D: ITPACKV 2D source code (vectorized for Cray Y-MP)

Testing Routine: for ITPACKV 2D

ITPACK 2C User's Guide in LaTeX

ITPACKV 2D User's Guide in LaTeX

Online Manuals

ITPACK 2C User's Guide

ITPACKV 2D User's Guide

Installation

%
% f77 dsrc2c.f myprog.f
%

See the ITPACK 2C User's Guide for details on how to use the routines in the package.

Publications

R. Grimes, D. Kincaid, W. Macgregor, and D. Young. ``ITPACK Report: Adaptive Iterative Algorithms Using Symmetric Sparse Storage," CNA-139, Center for Numerical Analysis, University of Texas, Austin, Texas, 78712, August 1978.

R. Grimes, D. Kincaid, and D. Young. ``ITPACK 2.0 User's Guide," CNA-150, Center for Numerical Analysis, University of Texas, Austin, Texas, 78712, August 1979.

R. Grimes, D. Kincaid, and D. Young. ``ITPACK 2A: A FORTRAN Implementation of Adaptive Accelerated Iterative Methods for Solving Large Sparse Linear Systems," CNA-164, Center for Numerical Analysis, University of Texas, Austin, Texas, 78712, October 1980.

D. Kincaid and R. Grimes. ``Numerical Studies of Several Adaptive Iterative Algorithms," CNA-126, Center for Numerical Analysis, University of Texas, Austin, Texas, 78712, August 1977.

D. Kincaid, R. Grimes, W. Macgregor, and D. Young. ``ITPACK--Adaptive Iterative Algorithms Using Symmetric Sparse Storage," in Symposium on Reservoir Simulation, Society of Petroleum Engineers of AIME, 6200 North Central Expressway, Dallas, Texas, 75206, February 1979, pp. 151-160.

D. Kincaid, R. Grimes, and D. Young. ``The Use of Iterative Methods for Solving Large Sparse PDE-Related Linear Systems," Mathematics and Computers in Simulation XXI, North-Holland Publishing Company, New York, 1979, pp. 368-375.

D. Kincaid and D. Young. ``Survey of Iterative Methods," in Encyclopedia of Computer Sciences and Technology, Vol. 13 (J. Belzer, A. Holzman, and A. Kent, eds.), Marcel Dekker, Inc., New York, 1979, pp. 354-391.

D. Kincaid and D. Young. ``Adapting Iterative Algorithms Developed for Symmetric Systems to Nonsymmetric Systems," in Elliptic Problem Solvers, (M. Schultz, ed.), Academic Press, New York, 1981, p. 353-359.

D. Kincaid. ``Acceleration Parameters for a Symmetric Successive Overrelaxation Conjugate Gradient Method for Nonsymmetric Systems," in Advances in Computer Methods for Partial Differential Equations IV, (R. Vichnevetsky and R. Stepleman, eds.), Publ. IMACS, Department of Computer Science, Rutgers University, New Brunswick, New Jersey, 08903, 1981, pp. 294-299.

D. Kincaid, R. Grimes, J. Respess, and D. Young. ``ITPACK 2B: A FORTRAN Implementation of Adaptive Accelerated Iterative Methods for Solving Large Sparse Linear Systems," CNA-173, Center for Numerical Analysis, University of Texas, Austin, Texas, 78712, September 1981.

D. Young and D. Kincaid. ``The ITPACK Package for Large Sparse Linear Systems," in Elliptic Problem Solvers, (M. Schultz, ed.), Academic Press, New York, 1981, pp. 163-185.