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75 lines
1.6 KiB
FortranFixed
75 lines
1.6 KiB
FortranFixed
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SUBROUTINE sort(n,arr)
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INTEGER n,M,NSTACK
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REAL arr(n)
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PARAMETER (M=7,NSTACK=50)
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INTEGER i,ir,j,jstack,k,l,istack(NSTACK)
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REAL a,temp
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jstack=0
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l=1
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ir=n
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1 if(ir-l.lt.M)then
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do 12 j=l+1,ir
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a=arr(j)
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do 11 i=j-1,1,-1
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if(arr(i).le.a)goto 2
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arr(i+1)=arr(i)
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11 continue
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i=0
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2 arr(i+1)=a
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12 continue
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if(jstack.eq.0)return
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ir=istack(jstack)
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l=istack(jstack-1)
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jstack=jstack-2
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else
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k=(l+ir)/2
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temp=arr(k)
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arr(k)=arr(l+1)
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arr(l+1)=temp
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if(arr(l+1).gt.arr(ir))then
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temp=arr(l+1)
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arr(l+1)=arr(ir)
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arr(ir)=temp
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endif
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if(arr(l).gt.arr(ir))then
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temp=arr(l)
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arr(l)=arr(ir)
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arr(ir)=temp
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endif
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if(arr(l+1).gt.arr(l))then
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temp=arr(l+1)
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arr(l+1)=arr(l)
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arr(l)=temp
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endif
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i=l+1
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j=ir
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a=arr(l)
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3 continue
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i=i+1
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if(arr(i).lt.a)goto 3
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4 continue
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j=j-1
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if(arr(j).gt.a)goto 4
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if(j.lt.i)goto 5
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temp=arr(i)
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arr(i)=arr(j)
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arr(j)=temp
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goto 3
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5 arr(l)=arr(j)
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arr(j)=a
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jstack=jstack+2
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if(jstack.gt.NSTACK)pause 'NSTACK too small in sort'
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if(ir-i+1.ge.j-l)then
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istack(jstack)=ir
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istack(jstack-1)=i
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ir=j-1
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else
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istack(jstack)=j-1
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istack(jstack-1)=l
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l=i
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endif
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endif
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goto 1
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END
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C (C) Copr. 1986-92 Numerical Recipes Software *(t9,12.
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