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c
c-----------------------------------------------------------------------
c
c subroutine: weave2
c this subroutine implements the post-weave modules
c of the wfta. the working arrays are sr and si.
c the routine checks to see which factors are present
c in the transform length n = na*nb*nc*nd and executes
c the post-weave code for these factors.
c
c-----------------------------------------------------------------------
c
subroutine weave2(sr,si)
common na,nb,nc,nd,nd1,nd2,nd3,nd4
dimension sr(1),si(1)
dimension q(8),t(16)
if(nd.ne.5) go to 700
c
c **********************************************************************
c
c the following code implements the 5 point post-weave module
c
c **********************************************************************
c
noff=nd1*nd2*nd3
nbase=1
do 510 n1=1,noff
nr1=nbase+noff
nr2=nr1+noff
nr3=nr2+noff
nr4=nr3+noff
nr5=nr4+noff
t1=sr(nbase)+sr(nr1)
t3=t1-sr(nr3)
t1=t1+sr(nr3)
t4=si(nr2)+si(nr5)
t2=si(nr4)+si(nr5)
sr(nr1)=t1-t4
sr4=t1+t4
sr2=t3+t2
sr(nr3)=t3-t2
t1=si(nbase)+si(nr1)
t3=t1-si(nr3)
t1=t1+si(nr3)
t4=sr(nr2)+sr(nr5)
t2=sr(nr4)+sr(nr5)
si(nr1)=t1+t4
si(nr4)=t1-t4
si(nr2)=t3-t2
si(nr3)=t3+t2
sr(nr2)=sr2
sr(nr4)=sr4
510 nbase=nbase+1
700 if(nc.ne.7) go to 300
c
c **********************************************************************
c
c the following code implements the 7 point post-weave module
c
c **********************************************************************
c
noff=nd1*nd2
nbase=1
nlup2=8*noff
do 740 n4=1,nd
do 710 n1=1,noff
nr1=nbase+noff
nr2=nr1+noff
nr3=nr2+noff
nr4=nr3+noff
nr5=nr4+noff
nr6=nr5+noff
nr7=nr6+noff
nr8=nr7+noff
t1=sr(nr1)+sr(nbase)
t2=t1-sr(nr3)-sr(nr4)
t4=t1+sr(nr3)-sr(nr7)
t1=t1+sr(nr4)+sr(nr7)
t6=si(nr2)+si(nr5)+si(nr8)
t5=si(nr2)-si(nr5)-si(nr6)
t3=si(nr2)+si(nr6)-si(nr8)
sr(nr1)=t1-t6
sr6=t1+t6
sr2=t2-t5
sr5=t2+t5
sr(nr4)=t4-t3
sr(nr3)=t4+t3
t1=si(nr1)+si(nbase)
t2=t1-si(nr3)-si(nr4)
t4=t1+si(nr3)-si(nr7)
t1=t1+si(nr4)+si(nr7)
t6=sr(nr2)+sr(nr5)+sr(nr8)
t5=sr(nr2)-sr(nr5)-sr(nr6)
t3=sr(nr2)+sr(nr6)-sr(nr8)
si(nr1)=t1+t6
si(nr6)=t1-t6
si(nr2)=t2+t5
si(nr5)=t2-t5
si(nr4)=t4+t3
si(nr3)=t4-t3
sr(nr2)=sr2
sr(nr5)=sr5
sr(nr6)=sr6
710 nbase=nbase+1
740 nbase=nbase+nlup2
300 if(nb.eq.1) go to 400
if(nb.ne.3) go to 900
c
c **********************************************************************
c
c the following code implements the 3 point post-weave module
c
c **********************************************************************
c
nlup2=2*nd1
nlup23=3*nd1*(nd3-nc)
nbase=1
noff=nd1
do 340 n5=1,nd
do 330 n4=1,nc
do 310 n2=1,nd1
nr1=nbase+noff
nr2=nr1+noff
t1=sr(nbase)+sr(nr1)
sr(nr1)=t1-si(nr2)
sr2=t1+si(nr2)
t1=si(nbase)+si(nr1)
si(nr1)=t1+sr(nr2)
si(nr2)=t1-sr(nr2)
sr(nr2)=sr2
310 nbase=nbase+1
330 nbase=nbase+nlup2
340 nbase=nbase+nlup23
900 if(nb.ne.9) go to 400
c
c **********************************************************************
c
c the following code implements the 9 point post-weave module
c
c **********************************************************************
c
nlup2=10*nd1
nlup23=11*nd1*(nd3-nc)
nbase=1
noff=nd1
do 940 n4=1,nd
do 930 n3=1,nc
do 910 n2=1,nd1
nr1=nbase+noff
nr2=nr1+noff
nr3=nr2+noff
nr4=nr3+noff
nr5=nr4+noff
nr6=nr5+noff
nr7=nr6+noff
nr8=nr7+noff
nr9=nr8+noff
nr10=nr9+noff
t3=sr(nbase)-sr(nr3)
t7=sr(nbase)+sr(nr1)
sr(nbase)=sr(nbase)+sr(nr3)+sr(nr3)
t6=t3+si(nr10)
sr(nr3)=t3-si(nr10)
t4=t7+sr(nr5)-sr(nr6)
t1=t7-sr(nr4)-sr(nr5)
t7=t7+sr(nr4)+sr(nr6)
sr(nr6)=t6
t8=si(nr2)-si(nr7)-si(nr8)
t5=si(nr2)+si(nr8)-si(nr9)
t2=si(nr2)+si(nr7)+si(nr9)
sr(nr1)=t7-t2
sr8=t7+t2
sr(nr4)=t1-t8
sr(nr5)=t1+t8
sr7=t4-t5
sr2=t4+t5
t3=si(nbase)-si(nr3)
t7=si(nbase)+si(nr1)
si(nbase)=si(nbase)+si(nr3)+si(nr3)
t6=t3-sr(nr10)
si(nr3)=t3+sr(nr10)
t4=t7+si(nr5)-si(nr6)
t1=t7-si(nr4)-si(nr5)
t7=t7+si(nr4)+si(nr6)
si(nr6)=t6
t8=sr(nr2)-sr(nr7)-sr(nr8)
t5=sr(nr2)+sr(nr8)-sr(nr9)
t2=sr(nr2)+sr(nr7)+sr(nr9)
si(nr1)=t7+t2
si(nr8)=t7-t2
si(nr4)=t1+t8
si(nr5)=t1-t8
si(nr7)=t4+t5
si(nr2)=t4-t5
sr(nr2)=sr2
sr(nr7)=sr7
sr(nr8)=sr8
910 nbase=nbase+1
930 nbase=nbase+nlup2
940 nbase=nbase+nlup23
400 if(na.eq.1) return
if(na.ne.4) go to 800
c
c **********************************************************************
c
c the following code implements the 4 point post-weave module
c
c **********************************************************************
c
nlup2=4*(nd2-nb)
nlup23=4*nd2*(nd3-nc)
nbase=1
do 440 n4=1,nd
do 430 n3=1,nc
do 420 n2=1,nb
nr1=nbase+1
nr2=nr1+1
nr3=nr2+1
tr0=sr(nbase)+sr(nr2)
tr2=sr(nbase)-sr(nr2)
tr1=sr(nr1)+sr(nr3)
tr3=sr(nr1)-sr(nr3)
ti1=si(nr1)+si(nr3)
ti3=si(nr1)-si(nr3)
sr(nbase)=tr0+tr1
sr(nr2)=tr0-tr1
sr(nr1)=tr2+ti3
sr(nr3)=tr2-ti3
ti0=si(nbase)+si(nr2)
ti2=si(nbase)-si(nr2)
si(nbase)=ti0+ti1
si(nr2)=ti0-ti1
si(nr1)=ti2-tr3
si(nr3)=ti2+tr3
420 nbase=nbase+4
430 nbase=nbase+nlup2
440 nbase=nbase+nlup23
800 if(na.ne.8) go to 1600
c
c **********************************************************************
c
c the following code implements the 8 point post-weave module
c
c **********************************************************************
c
nlup2=8*(nd2-nb)
nlup23=8*nd2*(nd3-nc)
nbase=1
do 840 n4=1,nd
do 830 n3=1,nc
do 820 n2=1,nb
nr1=nbase+1
nr2=nr1+1
nr3=nr2+1
nr4=nr3+1
nr5=nr4+1
nr6=nr5+1
nr7=nr6+1
t1=sr(nbase)-sr(nr1)
sr(nbase)=sr(nbase)+sr(nr1)
sr6=sr(nr2)+si(nr3)
sr(nr2)=sr(nr2)-si(nr3)
t4=sr(nr4)-si(nr5)
t5=sr(nr4)+si(nr5)
t6=sr(nr7)-si(nr6)
t7=sr(nr7)+si(nr6)
sr(nr4)=t1
sr(nr1)=t4+t6
sr3=t4-t6
sr5=t5-t7
sr(nr7)=t5+t7
t1=si(nbase)-si(nr1)
si(nbase)=si(nbase)+si(nr1)
t3=si(nr2)-sr(nr3)
si(nr2)=si(nr2)+sr(nr3)
t4=si(nr4)+sr(nr5)
t5=si(nr4)-sr(nr5)
si(nr6)=t3
t6=sr(nr6)+si(nr7)
t7=sr(nr6)-si(nr7)
si(nr4)=t1
si(nr1)=t4+t6
si(nr3)=t4-t6
si(nr5)=t5+t7
si(nr7)=t5-t7
sr(nr3)=sr3
sr(nr5)=sr5
sr(nr6)=sr6
820 nbase=nbase+8
830 nbase=nbase+nlup2
840 nbase=nbase+nlup23
1600 if(na.ne.16) return
c
c **********************************************************************
c
c the following code implements the 16 point post-weave module
c
c **********************************************************************
c
nlup2=18*(nd2-nb)
nlup23=18*nd2*(nd3-nc)
nbase=1
do 1640 n4=1,nd
do 1630 n3=1,nc
do 1620 n2=1,nb
nr1=nbase+1
nr2=nr1+1
nr3=nr2+1
nr4=nr3+1
nr5=nr4+1
nr6=nr5+1
nr7=nr6+1
nr8=nr7+1
nr9=nr8+1
nr10=nr9+1
nr11=nr10+1
nr12=nr11+1
nr13=nr12+1
nr14=nr13+1
nr15=nr14+1
nr16=nr15+1
nr17=nr16+1
t(2)=sr(nbase)-sr(nr1)
sr(nbase)=sr(nr1)+sr(nbase)
t(4)=sr(nr2)+si(nr3)
t(3)=sr(nr2)-si(nr3)
t(6)=sr(nr4)+si(nr5)
t(5)=sr(nr4)-si(nr5)
t(8)=-si(nr6)-sr(nr7)
t(7)=-si(nr6)+sr(nr7)
t(9)=sr(nr8)+sr(nr14)
t(15)=sr(nr8)-sr(nr14)
t(13)=-si(nr10)-si(nr12)
t(11)=si(nr10)-si(nr12)
t(16)=sr(nr15)-sr(nr17)
t(12)=sr(nr11)-sr(nr17)
t(10)=-si(nr9)-si(nr16)
t(14)=-si(nr16)+si(nr13)
sr(nr2)=t(5)+t(7)
sr6=t(5)-t(7)
sr10=t(6)+t(8)
sr(nr14)=t(6)-t(8)
q(7)=t(9)+t(10)
q(8)=t(9)-t(10)
q(1)=t(11)+t(12)
q(2)=t(11)-t(12)
q(4)=t(14)+t(15)
q(5)=t(15)-t(14)
q(3)=t(13)+t(16)
q(6)=t(13)-t(16)
sr(nr1)=q(3)+q(7)
sr(nr7)=q(7)-q(3)
sr9=q(8)+q(6)
sr(nr15)=q(8)-q(6)
sr5=q(1)+q(4)
sr3=q(4)-q(1)
sr13=q(2)+q(5)
sr11=q(5)-q(2)
sr(nr8)=t(2)
sr(nr4)=t(3)
sr12=t(4)
t(2)=si(nbase)-si(nr1)
si(nbase)=si(nr1)+si(nbase)
t(4)=si(nr2)-sr(nr3)
t(3)=si(nr2)+sr(nr3)
t(6)=si(nr4)-sr(nr5)
t(5)=si(nr4)+sr(nr5)
t(8)=sr(nr6)-si(nr7)
t(7)=sr(nr6)+si(nr7)
t(9)=si(nr8)+si(nr14)
t(15)=si(nr8)-si(nr14)
t(13)=sr(nr10)+sr(nr12)
t(11)=sr(nr12)-sr(nr10)
t(16)=si(nr15)-si(nr17)
t(12)=si(nr11)-si(nr17)
t(10)=sr(nr9)+sr(nr16)
si(nr2)=t(5)+t(7)
si(nr6)=t(5)-t(7)
si(nr10)=t(6)+t(8)
si(nr14)=t(6)-t(8)
q(7)=t(9)+t(10)
q(8)=t(9)-t(10)
q(1)=t(11)+t(12)
q(2)=t(11)-t(12)
q(4)=t(14)+t(15)
q(5)=t(15)-t(14)
q(3)=t(13)+t(16)
q(6)=t(13)-t(16)
si(nr1)=q(3)+q(7)
si(nr7)=q(7)-q(3)
si(nr9)=q(8)+q(6)
si(nr15)=q(8)-q(6)
si(nr5)=q(1)+q(4)
si(nr3)=q(4)-q(1)
si(nr13)=q(2)+q(5)
si(nr11)=q(5)-q(2)
si(nr8)=t(2)
si(nr4)=t(3)
si(nr12)=t(4)
sr(nr3)=sr3
sr(nr5)=sr5
sr(nr6)=sr6
sr(nr9)=sr9
sr(nr10)=sr10
sr(nr11)=sr11
sr(nr12)=sr12
sr(nr13)=sr13
1620 nbase=nbase+18
1630 nbase=nbase+nlup2
1640 nbase=nbase+nlup23
return
end
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