Revision 616fe292ea4c66f8db35d04c9fa045fea56eea02 authored by Roger Koenker on 04 September 2016, 13:02:15 UTC, committed by cran-robot on 04 September 2016, 13:02:15 UTC
1 parent db6345a
brute.f
``````C Output from Public domain Ratfor, version 1.0
subroutine brutpow(n,p,m,h,a,b,c,x,tau,u,xh,d,jminz,nflag)
integer n,p,m
double precision x(p),a(n,p),b(n),c(n)
double precision u(p,p),d(p),xh(p)
double precision zero, one,tau,pow,minz,z
integer h(p,m),k,findk,jminz,nflag
parameter(zero = 0.0d0, one = 1.d0)
minz = pow(n,p,x,a,b,c,tau)
do23000 j = 2,m
k = findk(p,h(1,j),h(1,j-1))
if(k .eq. 0)then
nflag = 4
return
endif
call pivot(n,p,h(1,j-1),h(k,j),h(k,j-1),a,u,d,xh,nflag)
if(nflag .gt. 0)then
return
endif
do23006 i = 1,p
xh(i) = b(h(i,j))
23006 continue
23007 continue
call dgemv('N',p,p,one,u,p,xh,1,zero,x,1)
z = pow(n,p,x,a,b,c,tau)
if(z .lt. minz)then
minz = z
jminz = j
endif
23000 continue
23001 continue
return
end
integer function findk(p,h,g)
integer p,k,h(p),g(p)
findk = 0
do23010 k = 1,p
if(h(k) .ne. g(k))then
findk = k
goto 23011
endif
23010 continue
23011 continue
return
end
``````

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