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subroutine i_x_i
c element wise product
include '../stack.h'
integer is1
external memused
integer memused
integer iadr,sadr
c
iadr(l)=l+l-1
sadr(l)=(l/2)+1
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(it1.ne.it2) then
top=top+1
fin=-fin
return
endif
c element wise operations
55 continue
i1=1
i2=1
if(n1.lt.0.and.mn2.ne.1.or.n2.lt.0.and.mn1.ne.1) then
call error(14)
return
endif
if(mn1.ne.1.and.mn2.ne.1) then
c check dimensions
if (m1.ne.m2 .or. n1.ne.n2) then
buf='inconsistent element-wise operation'
call error(9999)
return
endif
endif
lstk(top+1)=sadr(l1+memused(it1,max(mn1,mn2)))
err=lstk(top+1)-lstk(bot)
if(err.gt.0) then
call error(17)
return
endif
if (mn1 .eq. 1) then
c . cst.,a (inline product code)
if (m1.lt.0) then
if(mn2.eq.1) then
c . eye.*cst
istk(il1+1)=m1
istk(il1+2)=n1
istk(il1+3)=it1
else
call error(14)
return
endif
else
istk(il1+1)=m2
istk(il1+2)=n2
istk(il1+3)=it1
endif
call gencopy(it1,1,istk(l1),1,is1,1)
call gencopy(it1,mn2,istk(l2),1,istk(l1),1)
call genscal(it1,mn2,is1,istk(l1),1)
lstk(top+1)=sadr(l1+memused(it1,mn2))
elseif (mn2 .eq. 1) then
c . a.*cst (inline product code)
if(m2.lt.0) then
call error(14)
return
endif
call genscal(it1,mn1,istk(l2),istk(l1),1)
else
c matrix.*matrix
call genvmul(it1,mn1,istk(l2),i2,istk(l1),i1)
endif
return
end
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