IMSL Mathematics Reference Guide > 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 RTR 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.

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