# Plotting Graphs using Two Dimensional List in R Programming

List is a type of an object in R programming. Lists can contain heterogeneous elements like strings, numeric, matrices, or even lists. A list is a generic vector containing other objects. Two-dimensional list can be created in R programming by creating more lists in a list or simply, we can say nested lists. The `list()` function in R programming is used to create a list. In this article, we’ll learn to create plot graph using Two Dimensional List in R programming.

#### Creating a Two Dimensional list

A Two Dimensional list can be created with the use of `list()` function.

Syntax: list(x)

Parameter:
x: represents objects to be inserted in list

Example:

 `# Defining objects ` `x <``-` `c(``1``, ``2``, ``3``, ``4``) ` ` `  `y <``-` `LETTERS[``1``:``4``] ` ` `  `# Adding lists into a list ` `ls <``-` `list``( ` `  ``list``(x),  ` `  ``list``(y) ` `) ` ` `  `# Print list ` `print``(ls) `

Output:

```[[1]]
[[1]][[1]]
[1] 1 2 3 4

[[2]]
[[2]][[1]]
[1] "A" "B" "C" "D"

```

#### Creating Plot Graph using Two Dimensional List

To create plot graphs, lists have to be passed as vectors to the `plot()` function as coordinate values. The `unlist()` function converts the list into an atomic type of vector.

Example:

 `# Creating nested lists with random values ` `ls <``-` `list``( ` `  ``list``(rnorm(``20``, mean ``=` `10``, sd ``=` `2``)), ` `  ``list``(rnorm(``20``, mean ``=` `100``, sd ``=` `10``))) ` ` `  `# Output to be present as PNG file ` `png(``file` `=` `"2DListGraph.png"``) ` ` `  `# Plotting list ` `plot(unlist(ls[[``1``]]), unlist(ls[[``2``]])) ` ` `  `# Saving the file ` `dev.off() `

Output:

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