### 2.37.38 Make a matrix with a list : `list2mat`

`list2mat` takes as argument a list `l` and an integer
`p`.

`list2mat` returns a matrix having `p` column
by cutting the list `l` in rows of length `p`.
The matrix is filled with `0` if the size of `l` is not
a multiple of `p`.

Input :

`list2mat([5,8,1,9,5,6],2)`

Output :

`[[5,8],[1,9],[5,6]]`

Input :

`list2mat([5,8,1,9],3)`

Output :

`[[5,8,1],[9,0,0]]`

**Remark**

`Xcas` displays matrix with **[** and **]** and lists with [ and ]
as delimiters (the vertical bar of the brackets are thicker for matrices).