# Format Number of Decimal Places in R

Last Updated : 23 May, 2021

In this article we are going to discuss how to format numbers up to n decimal places in the R programming language. In R language, the decimal number is represented by . symbol

### Method 1: Format() function

Format() function can be used to format decimal values by rounding them and displaying only a specific number of elements after decimal.

Syntax:

format(round(value, n), nsmall = n)

Parameters:

It can take two parameters.

• round(value,n) function : which will specify the number of decimal places to be selected. It will take input number along with integer value that select decimal places of the given number
• nsmall function : which will specify the number of decimal places to be selected.It will take input number along with integer value that select decimal places of the given number

Result:

Formatted Decimal number.

Example:

## R

 `# define an variable and initialize ` `# to decimal number ` `a=12.4556785 ` ` `  `# display decimal places upto 3 ` `print``(``format``(``round``(a, 3), nsmall = 3)) ` ` `  `# display decimal places upto 4 ` `print``(``format``(``round``(a, 4), nsmall = 4)) ` `  `  `# display decimal places upto 0 ` `print``(``format``(``round``(a, 0), nsmall = 0)) ` ` `  `# display decimal places upto 1 ` `print``(``format``(``round``(a, 1), nsmall = 1)) `

Output:

Example 2:

## R

 `# define a vector with decimal ` `# elements  ` `a=``c``(12.4556785,1.345,6.789,7.890) ` ` `  `# display decimal places upto 3 ` `for ``(i ``in` `a){ ` `print``(``format``(``round``(i, 3), nsmall = 3)) ` `} `

Output:

### Method 2: Using sprintf() function

Using sprintf() function, we can specify the format of the decimal places along with the variable

Syntax: sprintf(variable, fmt = ‘%.nf’)

Parameters:

• variable – input decimal value
• fmt stands for format which will take parameter “.%nf” where n specifies number of decimal places to be selected.

Result:

formatted decimal number

Example 1:

## R

 `# decimal number ` `a=14.6788 ` `  `  `# format upto 4 places ` `print``( ``sprintf``(a, fmt = ``'%.4f'``)  ) ` ` `  `# format upto 8 places ` `print``( ``sprintf``(a, fmt = ``'%.8f'``)  ) ` ` `  `# format upto 1 place ` `print``( ``sprintf``(a, fmt = ``'%.1f'``)  ) ` ` `  `# format upto 0 places ` `print``( ``sprintf``(a, fmt = ``'%.0f'``)  ) `

Output:

Example 2:

## R

 `# define a vector with decimal elements  ` `a=``c``(12.4556785,1.345,6.789,7.89089) ` ` `  `# display decimal places upto 4 ` `for ``(i ``in` `a){ ` `print``( ``sprintf``(i, fmt = ``'%.4f'``)  ) ` `} ` `print``(``"---------------------"``) ` ` `  `# display decimal places upto 1 ` `for ``(i ``in` `a){ ` `print``( ``sprintf``(i, fmt = ``'%.1f'``)  ) ` `} ` `print``(``"---------------------"``) ` ` `  `# display decimal places upto 2 ` `for ``(i ``in` `a){ ` `print``( ``sprintf``(i, fmt = ``'%.2f'``)  ) ` `} ` `print``(``"---------------------"``) ` ` `  `# display decimal places upto 0 ` `for ``(i ``in` `a){ ` `print``( ``sprintf``(i, fmt = ``'%.0f'``)  ) ` `} `

Output:

### Method 3: Using options() function

This function is used to return the digits after the decimal.

Syntax:

options(digits = n)

Where digits is the number of digits to be returned along with number before decimal point.

Example:

a=1.24325454666

options(digits=4)

It will return 1.243

Example 1:

## R

 `# decimal number ` `a=14.67885350938953809580 ` ` `  `# format upto 4 places ` `options``(digits=4)   ` `print``(a) ` ` `  `# format upto 8 places ` `options``(digits=8)   ` `print``(a) ` ` `  `# format upto 3 place ` `options``(digits=3)   ` `print``(a) `

Output:

Example 2:

## R

 `# define a vector with decimal elements  ` `a=``c``(12.4556785,1.345,6.789,7.89089) ` ` `  `# display decimal places upto 4 ` `options``(digits=4) ` `for ``(i ``in` `a){ ` `print``( i  ) ` `} ` `print``(``"---------------------"``) ` ` `  `# display decimal places upto 6 ` `options``(digits=6) ` `for ``(i ``in` `a){ ` `print``( i  ) ` `} ` `print``(``"---------------------"``) ` ` `  `# display decimal places upto 2 ` `options``(digits=2) ` `for ``(i ``in` `a){ ` `print``( i  ) ` `} `

Output:

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