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subroutine i_f_i
c concatenation [a;b]
include '../stack.h'
common /mtlbc/ mmode
integer top0
external memused
integer memused
integer iadr,sadr
c
iadr(l)=l+l-1
sadr(l)=(l/2)+1
c
lw=lstk(top+1)
top0=top
c
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
c
il1=iadr(lstk(top))
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
if((istk(il1).ne.istk(il2).or.it1.ne.it2).and.
$ mn1.ne.0.and.mn2.ne.0) then
top=top0
fin=-fin
return
endif
76 if(n1.lt.0.or.n2.lt.0) then
call error(14)
return
elseif(n2.eq.0) then
c . [a;[]]
return
elseif(n1.eq.0)then
c . [[];b]
call unsfdcopy(lstk(top+2)-lstk(top+1),stk(lstk(top+1))
$ ,1,stk(lstk(top)),1)
lstk(top+1)=lstk(top)+lstk(top+2)-lstk(top+1)
return
elseif(n1.ne.n2) then
call error(6)
return
endif
m=m1+m2
mn=m*n1
lw1=max(iadr(lw),l1+memused(it1,mn)+1)
lw2=lw1+memused(it1,mn1)+1
err=sadr(lw2+memused(it1,mn2))-lstk(bot)
if(err.gt.0) then
call error(17)
return
endif
call gencopy(it1,mn2,istk(l2),1,istk(lw2),1)
call gencopy(it1,mn1,istk(l1),1,istk(lw1),1)
call genconcatcol(it1,istk(lw1),m1,n1,istk(lw2),m2,n2,istk(l1))
lstk(top+1)=sadr(il1+4+memused(it1,mn))
istk(il1+1)=m
istk(il1+2)=n1
istk(il1+3)=it1
999 return
end
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