https://github.com/cran/quantreg
Tip revision: d4080a3a276c7de207e13dbcd1535f15d2b7f7d1 authored by Roger Koenker on 27 October 2020, 18:10:02 UTC
version 5.75
version 5.75
Tip revision: d4080a3
extract.f
c
c Extract: Subroutine to extract the non-diagonal structure and
c entries from A stored in CSR format
c
subroutine extract(d,jd,id,dsub,jdsub,m,nnzd,nnzds,ierr)
integer jd(nnzd),jdsub(nnzds),id(*),m,mp1,ierr,nnzd,nnzds
double precision d(nnzd),dsub(nnzds)
c
c Call csrmsr in SPARSKIT2 to transform the storage format in d
c from csr to msr
c
call csrmsr(m,d,jd,id,dsub,jdsub,dsub,jdsub,nnzds,ierr)
mp1 = m + 1
do i=1,mp1
jdsub(i) = jdsub(i) - mp1
enddo
return
end