IMSL Mathematics Reference Guide
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Linear Systems
Linear Systems
This section contains the following topics:
Matrix Inversion
INV Function (PV-WAVE Advantage)
—General matrix inversion.
Linear Equations with Full Matrices
LUSOL Function (PV-WAVE Advantage)
—Systems involving general matrices.
LUFAC Procedure (PV-WAVE Advantage)
—
LU
factorization of general matrices.
CHSOL Function (PV-WAVE Advantage)
—Systems involving symmetric positive definite matrices.
CHFAC Procedure (PV-WAVE Advantage)
—Factorization of symmetric positive definite matrices.
Linear Least Squares with Full Matrices
QRSOL Function (PV-WAVE Advantage)
—Least-squares solution.
QRFAC Procedure (PV-WAVE Advantage)
—Least-squares factorization.
SVDCOMP Function (PV-WAVE Advantage)
—Singular Value Decomposition (SVD) and generalized inverse.
CHNNDSOL Function (PV-WAVE Advantage)
—Solve and generalized inverse for positive semidefinite matrices.
CHNNDFAC Procedure (PV-WAVE Advantage)
—Factor and generalized inverse for positive semidefinite matrices.
LINLSQ Function (PV-WAVE Advantage)
—Linear constraints.
Sparse Matrices
SP_LUSOL Function (PV-WAVE Advantage)
—Solve a sparse system of linear equations
Ax
=
b
.
SP_LUFAC Function (PV-WAVE Advantage)
—Compute an LU factorization of a sparse matrix stored in either coordinate format or CSC format.
SP_BDSOL Function (PV-WAVE Advantage)
—Solve a general band system of linear equations
Ax = b
.
SP_BDFAC Procedure (PV-WAVE Advantage)
—Compute the
LU
factorization of a matrix stored in band storage mode.
SP_PDSOL Function (PV-WAVE Advantage)
—Solve a sparse symmetric positive definite system of linear equations
Ax = b
.
SP_PDFAC Function (PV-WAVE Advantage)
—Compute a factorization of a sparse symmetric positive definite system of linear equations
Ax
=
b
.
SP_BDPDSOL Function (PV-WAVE Advantage)
—Solve a symmetric positive definite system of linear equations
Ax
=
b
in band symmetric storage mode.
SP_BDPDFAC Function (PV-WAVE Advantage)
—Compute the
R
T
R
Cholesky factorization of symmetric positive definite matrix,
A
, in band symmetric storage mode.
SP_GMRES Function (PV-WAVE Advantage)
—Solve a linear system
Ax
=
b
using the restarted generalized minimum residual (GMRES) method.
SP_CG Function (PV-WAVE Advantage)
—Solve a real symmetric definite linear system using a conjugate gradient method.
SP_MVMUL Function (PV-WAVE Advantage)
—Compute a matrix-vector product involving a sparse matrix and a dense vector.
Version 2017.0
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