Section 3: library functions
dlapy3.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlapy3 (X, Y, Z) DLAPY3 returns sqrt(x2+y2+z2). Function/Subroutine Documentation DOUBLE PRECISION function dlapy3 (double precisionX, double precisionY, double precisionZ) DLAPY3 returns sqrt(x2+y2+z2). Purpose: DLAPY3 returns sqrt(x**2+y**2+z**2), taking care not to cause unnecessary overflow. Parameters: X X is DOUBLE PRECISION Y Y is DOUBLE PRECISION Z Z is…
dlapy2.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlapy2 (X, Y) DLAPY2 returns sqrt(x2+y2). Function/Subroutine Documentation DOUBLE PRECISION function dlapy2 (double precisionX, double precisionY) DLAPY2 returns sqrt(x2+y2). Purpose: DLAPY2 returns sqrt(x**2+y**2), taking care not to cause unnecessary overflow. Parameters: X X is DOUBLE PRECISION Y Y is DOUBLE PRECISION X and Y specify the values…
dlapmt.f – Synopsis Functions/Subroutines subroutine dlapmt (FORWRD, M, N, X, LDX, K) DLAPMT performs a forward or backward permutation of the columns of a matrix. Function/Subroutine Documentation subroutine dlapmt (logicalFORWRD, integerM, integerN, double precision, dimension( ldx, * )X, integerLDX, integer, dimension( * )K) DLAPMT performs a forward or backward permutation of the columns of a…
dlapmr.f – Synopsis Functions/Subroutines subroutine dlapmr (FORWRD, M, N, X, LDX, K) DLAPMR rearranges rows of a matrix as specified by a permutation vector. Function/Subroutine Documentation subroutine dlapmr (logicalFORWRD, integerM, integerN, double precision, dimension( ldx, * )X, integerLDX, integer, dimension( * )K) DLAPMR rearranges rows of a matrix as specified by a permutation vector. Purpose:…
dlapll.f – Synopsis Functions/Subroutines subroutine dlapll (N, X, INCX, Y, INCY, SSMIN) DLAPLL measures the linear dependence of two vectors. Function/Subroutine Documentation subroutine dlapll (integerN, double precision, dimension( * )X, integerINCX, double precision, dimension( * )Y, integerINCY, double precisionSSMIN) DLAPLL measures the linear dependence of two vectors. Purpose: Given two column vectors X and Y,…
dlanv2.f – Synopsis Functions/Subroutines subroutine dlanv2 (A, B, C, D, RT1R, RT1I, RT2R, RT2I, CS, SN) DLANV2 computes the Schur factorization of a real 2-by-2 nonsymmetric matrix in standard form. Function/Subroutine Documentation subroutine dlanv2 (double precisionA, double precisionB, double precisionC, double precisionD, double precisionRT1R, double precisionRT1I, double precisionRT2R, double precisionRT2I, double precisionCS, double precisionSN) DLANV2…
dlantr.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlantr (NORM, UPLO, DIAG, M, N, A, LDA, WORK) DLANTR returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a trapezoidal or triangular matrix. Function/Subroutine Documentation DOUBLE PRECISION function dlantr (characterNORM, characterUPLO, characterDIAG, integerM, integerN,…
dlantp.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlantp (NORM, UPLO, DIAG, N, AP, WORK) DLANTP returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a triangular matrix supplied in packed form. Function/Subroutine Documentation DOUBLE PRECISION function dlantp (characterNORM, characterUPLO, characterDIAG, integerN, double…
dlantb.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlantb (NORM, UPLO, DIAG, N, K, AB, LDAB, WORK) DLANTB returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a triangular band matrix. Function/Subroutine Documentation DOUBLE PRECISION function dlantb (characterNORM, characterUPLO, characterDIAG, integerN, integerK, double…
dlansy.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlansy (NORM, UPLO, N, A, LDA, WORK) DLANSY returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a real symmetric matrix. Function/Subroutine Documentation DOUBLE PRECISION function dlansy (characterNORM, characterUPLO, integerN, double precision, dimension( lda, *…
dlanst.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlanst (NORM, N, D, E) DLANST returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a real symmetric tridiagonal matrix. Function/Subroutine Documentation DOUBLE PRECISION function dlanst (characterNORM, integerN, double precision, dimension( * )D, double precision,…
dlansp.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlansp (NORM, UPLO, N, AP, WORK) DLANSP returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a symmetric matrix supplied in packed form. Function/Subroutine Documentation DOUBLE PRECISION function dlansp (characterNORM, characterUPLO, integerN, double precision, dimension(…
dlansf.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlansf (NORM, TRANSR, UPLO, N, A, WORK) DLANSF returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a symmetric matrix in RFP format. Function/Subroutine Documentation DOUBLE PRECISION function dlansf (characterNORM, characterTRANSR, characterUPLO, integerN, double precision,…
dlansb.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlansb (NORM, UPLO, N, K, AB, LDAB, WORK) DLANSB returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a symmetric band matrix. Function/Subroutine Documentation DOUBLE PRECISION function dlansb (characterNORM, characterUPLO, integerN, integerK, double precision, dimension(…
dlanhs.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlanhs (NORM, N, A, LDA, WORK) DLANHS returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest absolute value of any element of an upper Hessenberg matrix. Function/Subroutine Documentation DOUBLE PRECISION function dlanhs (characterNORM, integerN, double precision, dimension( lda, * )A, integerLDA, double precision, dimension( *…
dlangt.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlangt (NORM, N, DL, D, DU) DLANGT returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest absolute value of any element of a general tridiagonal matrix. Function/Subroutine Documentation DOUBLE PRECISION function dlangt (characterNORM, integerN, double precision, dimension( * )DL, double precision, dimension( * )D, double…
dlange.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlange (NORM, M, N, A, LDA, WORK) DLANGE returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest absolute value of any element of a general rectangular matrix. Function/Subroutine Documentation DOUBLE PRECISION function dlange (characterNORM, integerM, integerN, double precision, dimension( lda, * )A, integerLDA, double precision,…
dlangb.f – Synopsis Functions/Subroutines DOUBLE PRECISION function dlangb (NORM, N, KL, KU, AB, LDAB, WORK) DLANGB returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest absolute value of any element of general band matrix. Function/Subroutine Documentation DOUBLE PRECISION function dlangb (characterNORM, integerN, integerKL, integerKU, double precision, dimension( ldab, * )AB, integerLDAB, double…
dlaneg.f – Synopsis Functions/Subroutines INTEGER function dlaneg (N, D, LLD, SIGMA, PIVMIN, R) DLANEG computes the Sturm count. Function/Subroutine Documentation INTEGER function dlaneg (integerN, double precision, dimension( * )D, double precision, dimension( * )LLD, double precisionSIGMA, double precisionPIVMIN, integerR) DLANEG computes the Sturm count. Purpose: DLANEG computes the Sturm count, the number of negative pivots…
dlamrg.f – Synopsis Functions/Subroutines subroutine dlamrg (N1, N2, A, DTRD1, DTRD2, INDEX) DLAMRG creates a permutation list to merge the entries of two independently sorted sets into a single set sorted in ascending order. Function/Subroutine Documentation subroutine dlamrg (integerN1, integerN2, double precision, dimension( * )A, integerDTRD1, integerDTRD2, integer, dimension( * )INDEX) DLAMRG creates a permutation…