2015-04-22 13:48:03 -04:00
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subroutine interleave4(id,ndir)
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integer*1 id(0:205),itmp(0:205)
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integer j0(0:205)
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logical first
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data first/.true./
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save first,j0
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if(first) then
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k=-1
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do i=0,255
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m=i
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n=iand(m,1)
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n=2*n + iand(m/2,1)
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n=2*n + iand(m/4,1)
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n=2*n + iand(m/8,1)
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n=2*n + iand(m/16,1)
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n=2*n + iand(m/32,1)
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n=2*n + iand(m/64,1)
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n=2*n + iand(m/128,1)
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if(n.le.205) then
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k=k+1
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j0(k)=n
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endif
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enddo
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first=.false.
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endif
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if(ndir.eq.1) then
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do i=0,205
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itmp(j0(i))=id(i)
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enddo
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else
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do i=0,205
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itmp(i)=id(j0(i))
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enddo
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endif
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do i=0,205
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id(i)=itmp(i)
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enddo
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return
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end subroutine interleave4
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