# Find the index of the maximum value in R DataFrame

Last Updated : 11 Nov, 2022

In this article, we will see how to find the index of the maximum value from a DataFrame in the R Programming Language

We can find the maximum value index in a dataframe using the which.max() function.

Syntax:

which.max(dataframe_name\$columnname)

“\$” is used to access particular column of a dataframe.

Given below are various implementations, depicting various datatypes and situations to help you understand better.

Example 1:

## R

 `# vector 1` `data1=``c``(``"sravan"``,``"bobby"``,``"pinkey"``,``"rohith"``,``"gnanesh"``)`   `# vector 2` `data2=``c``(98,78,79,97,89)`   `# creating a dataframe with names and marks ` `# using above vectors` `final <- ``data.frame``(names=data1,marks=data2)` `                   `  `print``(final)`   `# display the maximum value index in 2 nd column` `# (marks column) in a dataframe` `print``(``paste``(``"highest index is : "``,``which.max``(final\$marks)))`

Output:

If there is more than one maximum value, then it will return index of first number which is repeated.

Example 2:

## R

 `# vector 1` `data1=``c``(``"sravan"``,``"bobby"``,``"pinkey"``,``"rohith"``,` `        ``"gnanesh"``,``'divya'``,``"satwik"``,``"chandu"``)`   `# vector 2` `data2=``c``(98,78,79,97,89,89,99,99)`   `# creating a dataframe with names and marks ` `# using above vectors` `final <- ``data.frame``(names=data1,marks=data2)` `                   `  `print``(final)`   `print``(``paste``(``"highest index is : "``,``which.max``(final\$marks)))`

Output:

If the data is of type character, it will find the maximum value using ASCII values.

Example 3:

## R

 `# vector 1` `data1=``c``(``"sravan"``,``"bobby"``,``"pinkey"``,``"rohith"``,` `        ``"gnanesh"``,``'divya'``,``"satwik"``,``"zhandu"``)`   `# vector 2` `data2=``c``(98,78,79,97,89,89,99,99)`   `# creating a dataframe with names and marks ` `# using above vectors` `final <- ``data.frame``(names=data1,marks=data2)` `                   `  `print``(final)`   `# display maximum value index for character values` `print``(``paste``(``"highest index is : "``,``which.max``(final\$names)))`

Output:

Example 4:

## R

 `# vector 1 that contains NA values as characters` `data1=``c``(``NA``,``"sravan"``,``NA``,``NA``,``NA``)`   `# vector 2 contains all data` `data2=``c``(102,98,98,102,102)`   `# creating a dataframe with names and marks` `# using above vectors` `final <- ``data.frame``(names=data1,marks=data2)` `                   `  `print``(final)`   `# display maximum value index for character values` `print``(``paste``(``"highest index is : "``,``which.max``(final\$names)))`   `# display maximum value index for  marks values` `print``(``paste``(``"highest index is : "``,``which.max``(final\$marks)))`

Output:

If row containing all the values are same so all are higher. So it will return index of first element.

Example 5:

## R

 `# vector contains all same data` `data2=``c``(102,102,102,102,102)`   `# creating a dataframe marks using above vector` `final <- ``data.frame``(marks=data2)` `                   `  `print``(final)`   `# display maximum value index for  marks values` `print``(``paste``(``"highest index is : "``,``which.max``(final\$marks)))`

Output:

If the data contains values as NA, then it will return empty.

Example 6:

## R

 `# vector contains all NA's` `data2=``c``(``NA``,``NA``)`   `# creating a dataframe marks using` `# above vector` `final <- ``data.frame``(marks=data2)` `                   `  `print``(final)`   `# display maximum value index for  marks values` `print``(``paste``(``"highest index is : "``,``which.max``(final\$marks)))`

Output: