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SUBROUTINE VSTAT(V,ZQ,LENGTH)
C
C RETURNS STATISTICAL INFO ABOUT VECTOR V in ZQ
C ZQ(1) Largest absolute magnitude
C ZQ(2) Smallest absolute magnitude
C ZQ(3) Largest value
C ZQ(4) Smallest value
C ZQ(5) 2-norm
C ZQ(6) Dynamic range of the vector (abs. min. - abs. max.)
C
IMPLICIT DOUBLE PRECISION (A-H,O-Z)
DIMENSION V(LENGTH),ZQ(6)
U=0.D0
CALL ZERO(ZQ,6)
ZQ(2)=DABS(V(1))
ZQ(4)=V(1)
DO 20 I=1,LENGTH
ZQ(1)=MAX(ZQ(1),DABS(V(I)))
ZQ(2)=MIN(ZQ(2),DABS(V(I)))
ZQ(3)=MAX(ZQ(3),V(I))
ZQ(4)=MIN(ZQ(4),V(I))
20 U=U+V(I)*V(I)
If (Length .ne. 0) ZQ(5)=DSQRT(U/LENGTH)
ZQ(6)=ZQ(2)-ZQ(1)
RETURN
END
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