internal sort.e0

This function simply uses sort.list function in R. The reason for using it is that one wants the sort to carry along all columns.

1 | ```
sort_matrix(x, j)
``` |

`x` |
An input matrix with several columns |

`j` |
The column number with reference to which one wants to sort |

A sorted matrix

1 2 3 | ```
set.seed(30)
x=matrix(sample(1:50),ncol=5)
y=sort_matrix(x,3);y
``` |

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