New changes from l2g

w
2022-09-12 16:40:28 +00:00
parent 78eb7147d0
commit d713d4f61a
110 changed files with 87672 additions and 1098 deletions
@@ -0,0 +1,67 @@
+      DOUBLE PRECISION FUNCTION DNRM2(N,X,INCX)
+*     .. Scalar Arguments ..
+      INTEGER INCX,N
+*     ..
+*     .. Array Arguments ..
+      DOUBLE PRECISION X(*)
+*     ..
+*
+*  Purpose
+*  =======
+*
+*  DNRM2 returns the euclidean norm of a vector via the function
+*  name, so that
+*
+*     DNRM2 := sqrt( x'*x )
+*
+*  Further Details
+*  ===============
+*
+*  -- 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 ..
+      DOUBLE PRECISION ABSXI,NORM,SCALE,SSQ
+      INTEGER IX
+*     ..
+*     .. Intrinsic Functions ..
+      INTRINSIC ABS,SQRT
+*     ..
+      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