Hua-Zhou

Installation `sf` package in R on CentOS fails because `sf` requires gdal >v while CentOS yum install gives gdal v1.11.4.

1. Install Sqlite3 from source
```bash
configure
make -j4
sudo make install
```
Now system has two versions of Sqlite3 installed. One (old version) by yum, the other (most updated one) we just installed. 
Executable is installed in: /usr/local/bin/sqlite3

Hua-Zhou

import Base: convert, rand, size, getindex, A_mul_B!

immutable PLINK1Matrix <: AbstractMatrix{UInt8}
    m :: Int
    n :: Int
    data :: Array{UInt8}
end

size(M::PLINK1Matrix, i::Int) = i==1 ? M.m : i==2 ? M.n : error()
size(M::PLINK1Matrix) = (M.m, M.n)