head
Syntax
head(X, [n=1])
Arguments
X is a vector/matrix/table.
n is a positive integer. The default value is 1.
Details
Return the first n element(s) of a vector, or the first n columns of a matrix, or the first n rows of a table.
Examples
$ x=1..10; head(x);
1
$ x=1..10$2:5;
$ x;
#0 |
#1 |
#2 |
#3 |
#4 |
---|---|---|---|---|
1 |
3 |
5 |
7 |
9 |
2 |
4 |
6 |
8 |
10 |
$ x.head();
[1,2]
$ head(x,2);
#0 |
#1 |
---|---|
1 |
3 |
2 |
4 |
$ x=table(1..5 as a, 6..10 as b);
$ x;
a |
b |
---|---|
1 |
6 |
2 |
7 |
3 |
8 |
4 |
9 |
5 |
10 |
$ head(x);
b->6
a->1
$ x.head(2);
a |
b |
---|---|
1 |
6 |
2 |
7 |
Related function: tail