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Diffstat (limited to 'src/lib/blas/dnrm2.f')
-rw-r--r-- | src/lib/blas/dnrm2.f | 60 |
1 files changed, 0 insertions, 60 deletions
diff --git a/src/lib/blas/dnrm2.f b/src/lib/blas/dnrm2.f deleted file mode 100644 index 119d0477..00000000 --- a/src/lib/blas/dnrm2.f +++ /dev/null @@ -1,60 +0,0 @@ - DOUBLE PRECISION FUNCTION DNRM2 ( N, X, INCX ) -* .. Scalar Arguments .. - INTEGER INCX, N -* .. Array Arguments .. - DOUBLE PRECISION X( * ) -* .. -* -* DNRM2 returns the euclidean norm of a vector via the function -* name, so that -* -* DNRM2 := sqrt( x'*x ) -* -* -* -* -- This version written on 25-October-1982. -* Modified on 14-October-1993 to inline the call to DLASSQ. -* Sven Hammarling, Nag Ltd. -* -* -* .. Parameters .. - DOUBLE PRECISION ONE , ZERO - PARAMETER ( ONE = 1.0D+0, ZERO = 0.0D+0 ) -* .. Local Scalars .. - INTEGER IX - DOUBLE PRECISION ABSXI, NORM, SCALE, SSQ -* .. Intrinsic Functions .. - INTRINSIC ABS, SQRT -* .. -* .. Executable Statements .. - IF( N.LT.1 .OR. INCX.LT.1 )THEN - NORM = ZERO - ELSE IF( N.EQ.1 )THEN - NORM = ABS( X( 1 ) ) - ELSE - SCALE = ZERO - SSQ = ONE -* The following loop is equivalent to this call to the LAPACK -* auxiliary routine: -* CALL DLASSQ( N, X, INCX, SCALE, SSQ ) -* - DO 10, IX = 1, 1 + ( N - 1 )*INCX, INCX - IF( X( IX ).NE.ZERO )THEN - ABSXI = ABS( X( IX ) ) - IF( SCALE.LT.ABSXI )THEN - SSQ = ONE + SSQ*( SCALE/ABSXI )**2 - SCALE = ABSXI - ELSE - SSQ = SSQ + ( ABSXI/SCALE )**2 - END IF - END IF - 10 CONTINUE - NORM = SCALE * SQRT( SSQ ) - END IF -* - DNRM2 = NORM - RETURN -* -* End of DNRM2. -* - END |