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C DNRM2     SOURCE    CHAT      06/03/29    21:18:45     5360      FUNCTION DNRM2 ( N, X, INCX )      IMPLICIT INTEGER(I-N)      IMPLICIT REAL*8 (A-H,O-Z)-INC CCOPTIO*     .. Scalar Result ..      REAL*8                            DNRM2*     .. Scalar Arguments ..      INTEGER                           INCX, N*     .. Array Arguments ..      REAL*8                            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.**     Modified on 16/2/98 double precision -> real*8*                         added error handling*                         commented INTRINSIC (not esope compatible)*                         real*8 function  f -> function f ; real*8 f*     .. Parameters ..      REAL*8                ONE         , ZERO      PARAMETER           ( ONE = 1.0D+0, ZERO = 0.0D+0 )*     .. Local Scalars ..      INTEGER               IX      REAL*8                ABSXI, NORM, SCALE, SSQ*     .. Intrinsic Functions ..*      INTRINSIC             ABS, SQRT*     ..*     .. Executable Statements ..      IF( N.LT.1 .OR. INCX.LT.1 )THEN         NORM  = ZERO         GOTO 9999      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      RETURNC     Error handling 9999 CONTINUE      WRITE(IOIMP,*) 'Dimension or increment lower than 1'      WRITE(IOIMP,*) 'transmitted to function dnrm2'      WRITE(IOIMP,*) 'nil value returned'      DNRM2 = NORM      call erreur(21)      RETURN**     End of DNRM2.*      END

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