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subroutine lsposp(op,ma,na,nela,inda,mb,nb,nelb,indb,
c Copyright INRIA
$ nelc,indc,ierr)
c!purpose
c compare the elements of two sparse boolean matrices.
c!parameters
c op : integer flag which specifies the comparison to perform
c see routine dcompa for more precision
c ma,na: row and column dimension of the a matrix
c mb,nb: row and column dimension of the b matrix
c nela :integer: number of non zero elements of a
c nelb :integer: number of non zero elements of b
c nelc :integer:
c on entry maximum number of non zero elements of c
c on return number of non zero elements of c
c inda : a matrix control data:
c inda(i) 1<=i<=nr contains the number of ith row non zero elements
c of a
c inda(m+i) 1<=i<=nela column index of each non zero element
c indb : b matrix control data:
c indb(i) 1<=i<=nr contains the number of ith row non zero elements
c of b
c indb(m+i) 1<=i<=nelb column index of each non zero element
c
c indc : on return contains c matrix control data:
c indc(i) 1<=i<=nr contains the number of ith row non zero elements
c of c
c indc(m+i) 1<=i<=nelb column index of each non zero element
c ierr : if non zero initial value of nelc is to small
c !
integer op,nela,inda(*),nelb,indb(*),nelc,indc(*),ierr
c
integer jc,ka,kb,jb,i,ja,j1,j2
integer t
logical lcompa,z
external lcompa
c
nr=max(ma,mb)
nc=max(na,nb)
c
nelmx=nelc
ierr=0
c jc counts elements of c.
jc = 1
c ka,kb are numbers in first i rows of a,b.
ka = 1
kb = 1
kc = 1
c jb counts elements of b.
jb = 1
c i counts rows of a,b,c.
if(ma*na.eq.1.and.mb*nb.gt.1) then
c compare all element of b with scalar a
t=0
if(inda(1).eq.1) t=1
z=lcompa(t,0,op)
do 10 i=1,nr
indc(i)=0
nirb=indb(i)
jb=kb
jc=kc
if(nirb.eq.0) then
do 03 j=1,nc
if (z) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
03 continue
else
j2=indb(nr+jb)
do 04 j=1,nc
if(j2.eq.j) then
if (lcompa(t,1,op)) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
if(jb-kb+1.lt.nirb) jb=jb+1
j2=indb(nr+jb)
else
if (z) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
endif
04 continue
endif
kb=kb+indb(i)
indc(i)=jc-kc
kc=jc
10 continue
elseif(ma*na.gt.1.and.mb*nb.eq.1) then
c compare all elements of a with scalar b
t=0
if(indb(1).eq.1) t=1
z=lcompa(0,t,op)
do 20 i=1,nr
indc(i)=0
nira=inda(i)
ja=ka
jc=kc
if(nira.eq.0) then
if(z) then
if(kc+nc.gt.nelmx) goto 99
indc(i)=nc
do 11 j=1,nc
indc(nr+kc-1+j)=j
11 continue
jc=kc+nc
endif
else
j1=inda(nr+ja)
do 12 j=1,nc
if(j1.eq.j) then
if (lcompa(1,t,op)) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
if(ja-ka+1.lt.nira) ja=ja+1
j1=inda(nr+ja)
elseif(z) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
12 continue
endif
indc(i)=jc-kc
ka=ka+nira
kc=jc
20 continue
else
z=lcompa(0,0,op)
do 30 i=1,nr
indc(i)=0
nira=inda(i)
nirb=indb(i)
ja=ka
jb=kb
jc=kc
if(nira.eq.0) then
if(nirb.eq.0) then
if(z) then
if(kc+nc.gt.nelmx) goto 99
indc(i)=nc
do 21 j=1,nc
indc(nr+kc-1+j)=j
21 continue
jc=kc+nc
endif
else
j2=indb(nr+jb)
do 22 j=1,nc
if(j2.eq.j) then
if (lcompa(0,1,op)) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
if(jb-kb+1.lt.nirb) jb=jb+1
j2=indb(nr+jb)
elseif(z) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
22 continue
endif
else
if(nirb.eq.0) then
j1=inda(nr+ja)
do 23 j=1,nc
if(j1.eq.j) then
if (lcompa(1,0,op)) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
if(ja-ka+1.lt.nira) ja=ja+1
j1=inda(nr+ja)
elseif(z) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
23 continue
else
j1=inda(nr+ja)
j2=indb(nr+jb)
do 24 j=1,nc
if(j1.eq.j) then
if(j2.eq.j) then
if (lcompa(1,1,op)) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
if(ja-ka+1.lt.nira) ja=ja+1
if(jb-kb+1.lt.nirb) jb=jb+1
j1=inda(nr+ja)
j2=indb(nr+jb)
else
if (lcompa(1,0,op)) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
if(ja-ka+1.lt.nira) ja=ja+1
j1=inda(nr+ja)
endif
else
if(j2.eq.j) then
if (lcompa(0,1,op)) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
if(jb-kb+1.lt.nirb) jb=jb+1
j2=indb(nr+jb)
elseif(z) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
endif
24 continue
endif
endif
ka=ka+inda(i)
kb=kb+indb(i)
indc(i)=jc-kc
kc=jc
30 continue
endif
nelc = jc-1
return
c error messages.
99 ierr=1
c no more place for c
return
end
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