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---
:name: clartg
:md5sum: aa8c43ad25ac528306b6dc6dd6d172f6
:category: :subroutine
:arguments:
- f:
:type: complex
:intent: input
- g:
:type: complex
:intent: input
- cs:
:type: real
:intent: output
- sn:
:type: complex
:intent: output
- r:
:type: complex
:intent: output
:substitutions: {}
:fortran_help: " SUBROUTINE CLARTG( F, G, CS, SN, R )\n\n\
* Purpose\n\
* =======\n\
*\n\
* CLARTG generates a plane rotation so that\n\
*\n\
* [ CS SN ] [ F ] [ R ]\n\
* [ __ ] . [ ] = [ ] where CS**2 + |SN|**2 = 1.\n\
* [ -SN CS ] [ G ] [ 0 ]\n\
*\n\
* This is a faster version of the BLAS1 routine CROTG, except for\n\
* the following differences:\n\
* F and G are unchanged on return.\n\
* If G=0, then CS=1 and SN=0.\n\
* If F=0, then CS=0 and SN is chosen so that R is real.\n\
*\n\n\
* Arguments\n\
* =========\n\
*\n\
* F (input) COMPLEX\n\
* The first component of vector to be rotated.\n\
*\n\
* G (input) COMPLEX\n\
* The second component of vector to be rotated.\n\
*\n\
* CS (output) REAL\n\
* The cosine of the rotation.\n\
*\n\
* SN (output) COMPLEX\n\
* The sine of the rotation.\n\
*\n\
* R (output) COMPLEX\n\
* The nonzero component of the rotated vector.\n\
*\n\n\
* Further Details\n\
* ======= =======\n\
*\n\
* 3-5-96 - Modified with a new algorithm by W. Kahan and J. Demmel\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"
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