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subroutine wspos(op,ma,na,ar,ai,nela,inda,mb,nb,br,bi,
c Copyright INRIA
$ nelc,indc,ierr,ita,itb)
c!purpose
c compare the elements of a sparse matrix A and a full matrix B.
c!parameters
c a : array.
c Contain non zero elements of the A matrix
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 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<=ma contains the number of ith row non zero elements
c of a
c inda(ma+i) 1<=i<=nela column index of each non zero element
c indc : on return contains c matrix control data:
c indc(i) 1<=i<=mr contains the number of ith row non zero elements
c of c
c indc(mr+i) 1<=i<=nelb column index of each non zero element
c b :(mb,nb) matrix
c ierr : if non zero initial value of nelc is to small
c !
double precision ar(nela),ai(nela),br(mb,nb),bi(mb,nb)
integer op,nr,nc,nela,inda(*),nelc,indc(*),ierr
c
integer jc,ka,kb,jb,i,ja,j1
double precision tr,ti,tai,tbi
logical wcompa,z,z1
external wcompa
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
tr=0.0d0
ti=0.0d0
if(inda(1).eq.1) then
tr=ar(1)
ti=ai(1)
endif
z=wcompa(tr,ti,0.0d0,0.0d0,op)
do 10 i=1,nr
indc(i)=0
jc=kc
do 04 j=1,nc
if(itb.eq.0) then
z1=wcompa(tr,ti,br(i,j),0.0d0,op)
else
z1=wcompa(tr,ti,br(i,j),bi(i,j),op)
endif
if (z1) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
04 continue
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
tr=br(1,1)
ti=0.0d0
if(itb.ne.0) ti=bi(1,1)
z=wcompa(0.0d0,0.0d0,tr,ti,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(ita.eq.0) then
z1=wcompa(ar(ja),0.0d0,tr,ti,op)
else
z1=wcompa(ar(ja),ai(ja),tr,ti,op)
endif
if (z1) 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=wcompa(0.0d0,0.0d0,0.0d0,0.0d0,op)
do 30 i=1,nr
indc(i)=0
nira=inda(i)
ja=ka
jc=kc
if(nira.eq.0) then
do 22 j=1,nc
if(itb.eq.0) then
z1=wcompa(0.0d0,0.0d0,br(i,j),0.0d0,op)
else
z1=wcompa(0.0d0,0.0d0,br(i,j),bi(i,j),op)
endif
if (z1) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
22 continue
else
j1=inda(nr+ja)
do 24 j=1,nc
if(j1.eq.j) then
if(ita.eq.0) then
tai=0.0d0
else
tai=ai(ja)
endif
if(itb.eq.0) then
tbi=0.0d0
else
tbi=bi(i,j)
endif
if (wcompa(ar(ja),tai,br(i,j),tbi,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)
else
if(itb.eq.0) then
z1=wcompa(0.0d0,0.0d0,br(i,j),0.0d0,op)
else
z1=wcompa(0.0d0,0.0d0,br(i,j),bi(i,j),op)
endif
if (z1) then
if(jc+1.gt.nelmx) goto 99
indc(nr+jc)=j
jc=jc+1
endif
endif
24 continue
endif
ka=ka+inda(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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