mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-05 00:41:19 -05:00
2c17544f3f
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/WSJT/trunk@1 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
80 lines
1.9 KiB
Fortran
80 lines
1.9 KiB
Fortran
SUBROUTINE indexx(n,arr,indx)
|
|
INTEGER n,indx(n),M,NSTACK
|
|
REAL arr(n)
|
|
PARAMETER (M=7,NSTACK=50)
|
|
INTEGER i,indxt,ir,itemp,j,jstack,k,l,istack(NSTACK)
|
|
REAL a
|
|
do 11 j=1,n
|
|
indx(j)=j
|
|
11 continue
|
|
jstack=0
|
|
l=1
|
|
ir=n
|
|
1 if(ir-l.lt.M)then
|
|
do 13 j=l+1,ir
|
|
indxt=indx(j)
|
|
a=arr(indxt)
|
|
do 12 i=j-1,1,-1
|
|
if(arr(indx(i)).le.a)goto 2
|
|
indx(i+1)=indx(i)
|
|
12 continue
|
|
i=0
|
|
2 indx(i+1)=indxt
|
|
13 continue
|
|
if(jstack.eq.0)return
|
|
ir=istack(jstack)
|
|
l=istack(jstack-1)
|
|
jstack=jstack-2
|
|
else
|
|
k=(l+ir)/2
|
|
itemp=indx(k)
|
|
indx(k)=indx(l+1)
|
|
indx(l+1)=itemp
|
|
if(arr(indx(l+1)).gt.arr(indx(ir)))then
|
|
itemp=indx(l+1)
|
|
indx(l+1)=indx(ir)
|
|
indx(ir)=itemp
|
|
endif
|
|
if(arr(indx(l)).gt.arr(indx(ir)))then
|
|
itemp=indx(l)
|
|
indx(l)=indx(ir)
|
|
indx(ir)=itemp
|
|
endif
|
|
if(arr(indx(l+1)).gt.arr(indx(l)))then
|
|
itemp=indx(l+1)
|
|
indx(l+1)=indx(l)
|
|
indx(l)=itemp
|
|
endif
|
|
i=l+1
|
|
j=ir
|
|
indxt=indx(l)
|
|
a=arr(indxt)
|
|
3 continue
|
|
i=i+1
|
|
if(arr(indx(i)).lt.a)goto 3
|
|
4 continue
|
|
j=j-1
|
|
if(arr(indx(j)).gt.a)goto 4
|
|
if(j.lt.i)goto 5
|
|
itemp=indx(i)
|
|
indx(i)=indx(j)
|
|
indx(j)=itemp
|
|
goto 3
|
|
5 indx(l)=indx(j)
|
|
indx(j)=indxt
|
|
jstack=jstack+2
|
|
if(jstack.gt.NSTACK)pause 'NSTACK too small in indexx'
|
|
if(ir-i+1.ge.j-l)then
|
|
istack(jstack)=ir
|
|
istack(jstack-1)=i
|
|
ir=j-1
|
|
else
|
|
istack(jstack)=j-1
|
|
istack(jstack-1)=l
|
|
l=i
|
|
endif
|
|
endif
|
|
goto 1
|
|
END
|
|
C (C) Copr. 1986-92 Numerical Recipes Software *(t9,12.
|