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subroutine dmprod(flag,a,na,m,n,v,nv)
c!purpose
c computes the product of the entries of a matrix according to flag
c!calling sequence
c subroutine dmprod(flag,a,na,m,n,v,nv)
c double precision a(na,n),v(*)
c integer na,n,m,nv
c integer flag
c!parameters
c flag : indicates operation to perform
c 0 : returns in v(1) the product of all entries of a
c 1 : returns in v(j) the product of jth column of a
c 2 : returns in v(i) the product of ith row of a
c a : array containing the a matrix
c na : a matrix leading dimension
c m : a matrix row dimension
c n : a matrix column dimension
c v : array containing the result, may be confused with a row or
c a column of the a matrix
c if flag==0 size(v)>=1
c if flag==1 size(v)>=n*nv
c if flag==1 size(v)>=m*nv
c nv : increment between to consecutive entries ov v
c!
c Copyright INRIA
double precision a(na,n),v(nv)
integer na,n,m,nv
integer flag
c
double precision t
integer iv
c
iv=1
if(flag.eq.0) then
c product of all the entries
t=1.0d0
do 10 j=1,n
call dvmul(m,a(1,j),1,t,0)
10 continue
v(1)=t
elseif(flag.eq.1) then
do 20 j=1,n
t=1.0d0
call dvmul(m,a(1,j),1,t,0)
v(iv)=t
iv=iv+nv
20 continue
elseif(flag.eq.2) then
do 30 i=1,m
t=1.0d0
call dvmul(n,a(i,1),m,t,0)
v(iv)=t
iv=iv+nv
30 continue
endif
return
end
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