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28 lines
393 B
Fortran
28 lines
393 B
Fortran
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subroutine shell(n,a)
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integer n
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real a(n)
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integer i,j,inc
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real v
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inc=1
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1 inc=3*inc+1
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if(inc.le.n) go to 1
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2 inc=inc/3
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do i=inc+1,n
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v=a(i)
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j=i
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3 if(a(j-inc).gt.v) then
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a(j)=a(j-inc)
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j=j-inc
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if(j.le.inc) go to 4
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go to 3
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endif
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4 a(j)=v
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enddo
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if(inc.gt.1) go to 2
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return
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end subroutine shell
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