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subroutine i_s_i
c substraction
include '../stack.h'
common /mtlbc/ mmode
integer is1
integer is2
external memused
integer memused
integer iadr,sadr
c
iadr(l)=l+l-1
sadr(l)=(l/2)+1
c
il1=iadr(lstk(top-rhs+1))
if(istk(il1).lt.0) il1=iadr(istk(il1+1))
m1=istk(il1+1)
n1=istk(il1+2)
it1=istk(il1+3)
l1=il1+4
mn1=m1*n1
c
if(rhs.eq.1) then
c . unary minus
if(mn1.gt.0) then
call tpconv(4,it1,1,-1,1,is2,1)
call genscal(it1,mn1,is2,istk(l1),1)
endif
return
endif
il2=iadr(lstk(top))
if(istk(il2).lt.0) il2=iadr(istk(il2+1))
m2=istk(il2+1)
n2=istk(il2+2)
it2=istk(il2+3)
l2=il2+4
mn2=m2*n2
top=top-1
if(istk(il1).ne.8.or.istk(il2).ne.8) then
if((istk(il1).eq.1.and.it1.eq.0).or.
& (istk(il2).eq.1.and.it2.eq.0) ) goto 06
top=top+1
fin=-fin
return
endif
06 if(it1.ne.it2.and.mn1.ne.0.and.mn2.ne.0) then
top=top+1
fin=-fin
return
endif
if (mn1.eq.0) then
if (mmode.eq.1) then
c . Matlab like []+a=[]
else
c . []-a=-a
call icopy(4,istk(il2),1,istk(il1),1)
call tpconv(4,it2,1,-1,1,is2,1)
call gencopy(it2,mn2,istk(l2),1,istk(l1),1)
call genscal(it2,mn2,is2,istk(l1),1)
lstk(top+1)=sadr(l1+memused(it2,mn2))
endif
elseif (mn2.eq.0) then
if (mmode.eq.1) then
c . Matlab like a-[]=[]
istk(il1+1)=0
istk(il1+2)=0
istk(il1+3)=0
lstk(top+1)=sadr(il1+4)
else
c . a-[]=a
endif
elseif (m1 .lt. 0) then
c . eye-vector
c go to 40
elseif (m2 .lt. 0) then
c . vector-eye
c go to 41
elseif (mn2.eq.1) then
c . vector-const
call gensubst(it1,mn1,istk(l1),1,istk(l2),0)
lstk(top+1)=sadr(l1+memused(it1,mn1))
elseif (mn1.eq.1) then
c . cst-vector
call gencopy(it1,1,istk(l1),1,is1,1)
call gencopy(it1,mn2,istk(l2),1,istk(l1),1)
call gensubst(it1,mn2,istk(l1),1,is1,0)
lstk(top+1)=sadr(l1+memused(it1,mn2))
istk(il1+1)=m2
istk(il1+2)=n2
else
c . vector-vector
if (m1 .ne. m2.or.n1 .ne. n2) then
call error(8)
return
endif
call gensubst(it1,mn1,istk(l1),1,istk(l2),1)
lstk(top+1)=sadr(l1+memused(it1,mn1))
endif
999 return
end
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