type - variable type
type(x) returns an integer which is the type of x as following :
1 : real or complex constant matrix.
2 : polynomial matrix.
4 : boolean matrix.
5 : sparse matrix.
8 : matrix of integers stored on 1 2 or 4 bytes
10 : matrix of character strings.
11 : un-compiled function.
13 : compiled function.
14 : function library.
15 : list.
16 : typed list (tlist)
17 : mlist
128 : pointer