# dlartg.f(3) [centos man page]

dlartg.f(3) LAPACK dlartg.f(3)NAME

dlartg.f-SYNOPSIS

Functions/Subroutines subroutine dlartg (F, G, CS, SN, R) DLARTG generates a plane rotation with real cosine and real sine.Function/Subroutine Documentation subroutine dlartg (double precisionF, double precisionG, double precisionCS, double precisionSN, double precisionR) DLARTG generates a plane rotation with real cosine and real sine. Purpose: DLARTG generate a plane rotation so that [ CS SN ] . [ F ] = [ R ] where CS**2 + SN**2 = 1. [CS ] [ G ] [ 0 ] This is a slower, more accurate version of the BLAS1 routine DROTG, with the following other differences: F and G are unchanged on return. If G=0, then CS=1 and SN=0. If F=0 and (G .ne. 0), then CS=0 and SN=1 without doing any floating point operations (saves work in DBDSQR when there are zeros on the diagonal). If F exceeds G in magnitude, CS will be positive. Parameters: F F is DOUBLE PRECISION The first component of vector to be rotated. G G is DOUBLE PRECISION The second component of vector to be rotated. CS CS is DOUBLE PRECISION The cosine of the rotation. SN SN is DOUBLE PRECISION The sine of the rotation. R R is DOUBLE PRECISION The nonzero component of the rotated vector. This version has a few statements commented out for thread safety (machine parameters are computed on each entry). 10 feb 03, SJH. Author: Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. Date: September 2012 Definition at line 98 of file dlartg.f.-SNAuthorGenerated automatically by Doxygen for LAPACK from the source code.Version 3.4.2Tue Sep 25 2012 dlartg.f(3)

## Check Out this Related Man Page

dlartgp.f(3) LAPACK dlartgp.f(3)NAME

dlartgp.f-SYNOPSIS

Functions/Subroutines subroutine dlartgp (F, G, CS, SN, R) DLARTGP generates a plane rotation so that the diagonal is nonnegative.Function/Subroutine Documentation subroutine dlartgp (double precisionF, double precisionG, double precisionCS, double precisionSN, double precisionR) DLARTGP generates a plane rotation so that the diagonal is nonnegative. Purpose: DLARTGP generates a plane rotation so that [ CS SN ] . [ F ] = [ R ] where CS**2 + SN**2 = 1. [CS ] [ G ] [ 0 ] This is a slower, more accurate version of the Level 1 BLAS routine DROTG, with the following other differences: F and G are unchanged on return. If G=0, then CS=(+/-)1 and SN=0. If F=0 and (G .ne. 0), then CS=0 and SN=(+/-)1. The sign is chosen so that R >= 0. Parameters: F F is DOUBLE PRECISION The first component of vector to be rotated. G G is DOUBLE PRECISION The second component of vector to be rotated. CS CS is DOUBLE PRECISION The cosine of the rotation. SN SN is DOUBLE PRECISION The sine of the rotation. R R is DOUBLE PRECISION The nonzero component of the rotated vector. This version has a few statements commented out for thread safety (machine parameters are computed on each entry). 10 feb 03, SJH. Author: Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. Date: September 2012 Definition at line 96 of file dlartgp.f.-SNAuthorGenerated automatically by Doxygen for LAPACK from the source code.Version 3.4.2Tue Sep 25 2012 dlartgp.f(3)