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# Convert a Data Frame into a Numeric Matrix in R Programming – data.matrix() Function

• Difficulty Level : Basic
• Last Updated : 16 Jun, 2020

`data.matrix()` function in R Language is used to create a matrix by converting all the values of a Data Frame into numeric mode and then binding them as a matrix.

Syntax: data.matrix(df)

Parameters:
df: Data frame to be converted.

Example 1:

 `# R program to convert a data frame ` `# into a numeric matrix ` `   `  `# Creating a dataframe  ` `df1 ``=` `data.frame(  ` `  ``"Name"` `=` `c(``"Amar"``, ``"Akbar"``, ``"Ronald"``),  ` `  ``"Language"` `=` `c(``"R"``, ``"Python"``, ``"C#"``),  ` `  ``"Age"` `=` `c(``26``, ``38``, ``22``)  ` `)  ` ` `  `# Printing data frame ` `print``(df1) ` ` `  `# Converting into numeric matrix ` `df2 <``-` `data.matrix(df1) ` `df2 `

Output:

```    Name Language Age
1   Amar        R  26
2  Akbar   Python  38
3 Ronald       C#  22
Name Language Age
[1, ]    2        3  26
[2, ]    1        2  38
[3, ]    3        1  22
```

Example 2:

 `# R program to convert a data frame ` `# into a numeric matrix ` `   `  `# Creating a dataframe  ` `df <``-` `data.frame(sample(LETTERS[``1``:``4``], ``8``,  ` `                 ``replace ``=` `T), cbind(``1``:``4``, ``1``:``8``)) ` `colnames(df) <``-` `c(``"x"``, ``"y"``, ``"z"``) ` ` `  `# Printing data frame ` `print``(df) ` ` `  `# Converting into numeric matrix ` `df2 <``-` `data.matrix(df) ` `df2 `

Output:

```  x y z
1 A 1 1
2 D 2 2
3 C 3 3
4 A 4 4
5 B 1 5
6 B 2 6
7 A 3 7
8 C 4 8
x y z
[1, ] 1 1 1
[2, ] 4 2 2
[3, ] 3 3 3
[4, ] 1 4 4
[5, ] 2 1 5
[6, ] 2 2 6
[7, ] 1 3 7
[8, ] 3 4 8
```

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