This is an R package for Sparse Column-wise Inverse Operator.
The easiest way to install this package from GitHub is by the following R code:
install.packages("devtools")
library(devtools)
install_github("rluo/scio")
You can use R CMD build scio
to build the source package. This should yield the same as the CRAN package scio, because I will try to update the CRAN source as soon as I can.