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---
:name: dlartgp
:md5sum: bed8b61858c5189bd7a27d2f840c6ce8
:category: :subroutine
:arguments:
- f:
:type: doublereal
:intent: input
- g:
:type: doublereal
:intent: input
- cs:
:type: doublereal
:intent: output
- sn:
:type: doublereal
:intent: output
- r:
:type: doublereal
:intent: output
:substitutions: {}
:fortran_help: " SUBROUTINE DLARTGP( F, G, CS, SN, R )\n\n\
* Purpose\n\
* =======\n\
*\n\
* DLARTGP generates a plane rotation so that\n\
*\n\
* [ CS SN ] . [ F ] = [ R ] where CS**2 + SN**2 = 1.\n\
* [ -SN CS ] [ G ] [ 0 ]\n\
*\n\
* This is a slower, more accurate version of the Level 1 BLAS routine DROTG,\n\
* with the following other differences:\n\
* F and G are unchanged on return.\n\
* If G=0, then CS=(+/-)1 and SN=0.\n\
* If F=0 and (G .ne. 0), then CS=0 and SN=(+/-)1.\n\
*\n\
* The sign is chosen so that R >= 0.\n\
*\n\n\
* Arguments\n\
* =========\n\
*\n\
* F (input) DOUBLE PRECISION\n\
* The first component of vector to be rotated.\n\
*\n\
* G (input) DOUBLE PRECISION\n\
* The second component of vector to be rotated.\n\
*\n\
* CS (output) DOUBLE PRECISION\n\
* The cosine of the rotation.\n\
*\n\
* SN (output) DOUBLE PRECISION\n\
* The sine of the rotation.\n\
*\n\
* R (output) DOUBLE PRECISION\n\
* The nonzero component of the rotated vector.\n\
*\n\
* This version has a few statements commented out for thread safety\n\
* (machine parameters are computed on each entry). 10 feb 03, SJH.\n\
*\n\n\
* =====================================================================\n\
*\n"
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