rpl/lapack/blas/drotg.f - diff

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Diff for /rpl/lapack/blas/drotg.f between versions 1.2 and 1.10

-version 1.2, 2010/04/21 13:45:09
+version 1.10, 2012/12/14 14:22:02
  Line 1
-       SUBROUTINE DROTG(DA,DB,C,S)
+ *> \brief \b DROTG
- *     .. Scalar Arguments ..
+ *
-       DOUBLE PRECISION C,DA,DB,S
+ *  =========== DOCUMENTATION ===========
- *     ..
  *
- *  Purpose
+ * Online html documentation available at
- *  =======
+ *            http://www.netlib.org/lapack/explore-html/
  *
- *     DROTG construct givens plane rotation.
+ *  Definition:
+ *  ===========
+ *
+ *       SUBROUTINE DROTG(DA,DB,C,S)
+ *
+ *       .. Scalar Arguments ..
+ *       DOUBLE PRECISION C,DA,DB,S
+ *       ..
+ *
+ *
+ *> \par Purpose:
+ *  =============
+ *>
+ *> \verbatim
+ *>
+ *>    DROTG construct givens plane rotation.
+ *> \endverbatim
+ *
+ *  Authors:
+ *  ========
+ *
+ *> \author Univ. of Tennessee
+ *> \author Univ. of California Berkeley
+ *> \author Univ. of Colorado Denver
+ *> \author NAG Ltd.
+ *
+ *> \date November 2011
+ *
+ *> \ingroup double_blas_level1
+ *
+ *> \par Further Details:
+ *  =====================
+ *>
+ *> \verbatim
+ *>
+ *>     jack dongarra, linpack, 3/11/78.
+ *> \endverbatim
+ *>
+ *  =====================================================================
+       SUBROUTINE DROTG(DA,DB,C,S)
  *
- *  Further Details
+ *  -- Reference BLAS level1 routine (version 3.4.0) --
- *  ===============
+ *  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
+ *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
+ *     November 2011
  *
- *     jack dongarra, linpack, 3/11/78.
+ *     .. Scalar Arguments ..
+       DOUBLE PRECISION C,DA,DB,S
+ *     ..
  *
  *  =====================================================================
  *
- Line 24
+ Line 66
        ROE = DB
        IF (DABS(DA).GT.DABS(DB)) ROE = DA
        SCALE = DABS(DA) + DABS(DB)
-       IF (SCALE.NE.0.0d0) GO TO 10
+       IF (SCALE.EQ.0.0d0) THEN
-       C = 1.0d0
+          C = 1.0d0
-       S = 0.0d0
+          S = 0.0d0
-       R = 0.0d0
+          R = 0.0d0
-       Z = 0.0d0
+          Z = 0.0d0
-       GO TO 20
+       ELSE
-R = SCALE*DSQRT((DA/SCALE)**2+ (DB/SCALE)**2)
+          R = SCALE*DSQRT((DA/SCALE)**2+ (DB/SCALE)**2)
-       R = DSIGN(1.0d0,ROE)*R
+          R = DSIGN(1.0d0,ROE)*R
-       C = DA/R
+          C = DA/R
-       S = DB/R
+          S = DB/R
-       Z = 1.0d0
+          Z = 1.0d0
-       IF (DABS(DA).GT.DABS(DB)) Z = S
+          IF (DABS(DA).GT.DABS(DB)) Z = S
-       IF (DABS(DB).GE.DABS(DA) .AND. C.NE.0.0d0) Z = 1.0d0/C
+          IF (DABS(DB).GE.DABS(DA) .AND. C.NE.0.0d0) Z = 1.0d0/C
-DA = R
+       END IF
+       DA = R
        DB = Z
        RETURN
        END

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	Added in v.1.10