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IRIX 6.2 Development Libraries
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SGI IRIX 6.2 Development Libraries.iso
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complib.idb
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slartg.z
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slartg
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1996-03-14
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2KB
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67 lines
SSSSLLLLAAAARRRRTTTTGGGG((((3333FFFF)))) SSSSLLLLAAAARRRRTTTTGGGG((((3333FFFF))))
NNNNAAAAMMMMEEEE
SLARTG - generate a plane rotation so that [ CS SN ]
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
SUBROUTINE SLARTG( F, G, CS, SN, R )
REAL CS, F, G, R, SN
PPPPUUUURRRRPPPPOOOOSSSSEEEE
SLARTG generate a plane rotation so that
[ -SN CS ] [ G ] [ 0 ]
This is a slower, more accurate version of the BLAS1 routine SROTG, 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 SBDSQR when
there are zeros on the diagonal).
If F exceeds G in magnitude, CS will be positive.
AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
F (input) REAL
The first component of vector to be rotated.
G (input) REAL
The second component of vector to be rotated.
CS (output) REAL
The cosine of the rotation.
SN (output) REAL
The sine of the rotation.
R (output) REAL
The nonzero component of the rotated vector.
PPPPaaaaggggeeee 1111