head

`head` is a function that returns the first parts of a data set.

== Examples
https://www.geeksforgeeks.org/get-the-first-parts-of-a-data-set-in-r-programming-head-function/[Examples Source]

=== How do I display the first 10 lines of a dataset?

.Click to see solution
[%collapsible]
====
[source, R]
----
# R program to illustrate
# head function

# Calling the head() function to
# get the iris demo dataset
head(iris)
----
[source, R]
----
Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1          5.1         3.5          1.4         0.2  setosa
2          4.9         3.0          1.4         0.2  setosa
3          4.7         3.2          1.3         0.2  setosa
4          4.6         3.1          1.5         0.2  setosa
5          5.0         3.6          1.4         0.2  setosa
6          5.4         3.9          1.7         0.4  setosa
----
The default display for the head equation is 10 rows. However, as shown above, for datasets with less than 10 rows, it will simply display all the rows.
====

=== How do I display the first `n` lines of a dataset?

.Click to see solution
[%collapsible]
====
[source, R]
----
# R program to illustrate
# head function

# Calling the head() function to
# get the iris demo dataset in
# 4 rows
head(iris, 4)
----
[source, R]
----
Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1          5.1         3.5          1.4         0.2  setosa
2          4.9         3.0          1.4         0.2  setosa
3          4.7         3.2          1.3         0.2  setosa
4          4.6         3.1          1.5         0.2  setosa
----
In this case, the 4 can be replaced with any numerical value to display that number of rows from the dataset.
====