# Condense Column Values of a Data Frame in R Programming – summarise() Function

`summarise()` function in R Language is used to condense various values of column of a data frame to one value.

Syntax: summarise(x, expr)

Parameters:
x: Data Frame
expr: Operation to condense data

Example 1:

 `# R program to condense data ` `# of a data frame ` ` `  `# Loading library  ` `library(dplyr) ` `   `  `# Create a data frame ` `d <``-` `data.frame( name ``=` `c(``"Abhi"``, ``"Bhavesh"``, ``"Chaman"``, ``"Dimri"``),   ` `                 ``age ``=` `c(``7``, ``5``, ``9``, ``16``),   ` `                 ``ht ``=` `c(``46``, NA, NA, ``69``),  ` `                 ``school ``=` `c(``"yes"``, ``"yes"``, ``"no"``, ``"no"``) )  ` ` `  `# Calculating min age  ` `summarise(d, min_age ``=` `min``(age))  ` `   `  `# Calculating max age  ` `summarise(d, max_age ``=` `max``(age))  `

Output:

```  min_age
1       5
max_age
1      16
```

Example 2:

 `# R program to condense data ` `# of a data frame ` ` `  `# Loading library  ` `library(dplyr) ` `   `  `# Create a data frame ` `d <``-` `data.frame( name ``=` `c(``"Abhi"``, ``"Bhavesh"``, ``"Chaman"``, ``"Dimri"``),   ` `                 ``age ``=` `c(``7``, ``5``, ``9``, ``16``),   ` `                 ``ht ``=` `c(``46``, NA, NA, ``69``),  ` `                 ``school ``=` `c(``"yes"``, ``"yes"``, ``"no"``, ``"no"``) )  ` ` `  `# Calculating mean of age  ` `summarise(d, mean ``=` `mean(age))  ` ` `  `# Calculating median of age  ` `summarise(d, med ``=` `median(age))  `

Output:

```  mean
1 9.25
med
1   8
```

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