# Installing and using package for rref
**URL:** https://discourse.julialang.org/t/installing-and-using-package-for-rref/2932
**Category:** General Usage
**Created:** [March 28, 2017, 3:51pm UTC](https://discourse.julialang.org/t/installing-and-using-package-for-rref/2932 "2017-03-28T15:51:40Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@monsij](https://discourse.julialang.org/u/monsij)
#### Post date: [March 28, 2017, 3:51pm UTC](https://discourse.julialang.org/t/installing-and-using-package-for-rref/2932/1 "2017-03-28T15:51:40Z")
Can someone please help me to install the packages from Windows command line.I want to implement rref functionality. It’s showing non registered beside every package name when I query Pkg.status().I have installed them manually.Currently it’s showing UndefVarError: rref not defined.
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### Author:  [@dpsanders](https://discourse.julialang.org/u/dpsanders)
#### Post date: [March 28, 2017, 3:52pm UTC](https://discourse.julialang.org/t/installing-and-using-package-for-rref/2932/2 "2017-03-28T15:52:50Z")
What is rref functionality?
What do you mean by “I have installed them manually”?
Please post the output of `Pkg.status()` and `versioninfo()`.
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### Author:  [@kristoffer.carlsson](https://discourse.julialang.org/u/kristoffer.carlsson)
#### Post date: [March 28, 2017, 3:57pm UTC](https://discourse.julialang.org/t/installing-and-using-package-for-rref/2932/3 "2017-03-28T15:57:13Z")
R(r)ef: [https://github.com/JuliaLang/julia/pull/9804](https://github.com/JuliaLang/julia/pull/9804)
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### Author:  [@PabloZubieta](https://discourse.julialang.org/u/PabloZubieta)
#### Post date: [March 28, 2017, 3:58pm UTC](https://discourse.julialang.org/t/installing-and-using-package-for-rref/2932/4 "2017-03-28T15:58:28Z")
There was an `rref` in `Base` but got moved to `RowEchelon.jl`. Do you have it installed? If not, do
```julia
Pkg.add("RowEchelon")
using RowEchelon
# and do whatever with rref
```