Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
Articles by Nizamuddin Siddiqui
Page 127 of 196
How to add single quotes to strings in an R data frame column?
To add single quotes to strings in an R data frame column, we can use paste0 function. This will cover the strings with single quotes from both the sides but we can add them at the initial or only at the last position.To add them on both the sides, we can use the following syntax −Data_frame$Column
Read MoreHow to stop default printing of large numbers in R?
When we write a long number in R, by default the printed output of that number is in scientific notation. To stop this printing behavior we can use sprint function.For example, if we have a data frame called df that contains a column say X having long numbers then we can stop printing of these numbers in scientific notation by using the below given command −df$X
Read MoreHow to associate a character to numbers in an R data frame column?
Sometimes a variable has a character associated with the numerical values such as variable name etc. If we want to associate a character to numbers then paste0 function can be used.For example, if we have a data frame called df that contains a column say X then we can associate X to each value in the column by using the command given below −df$X
Read MoreHow to remove only the first duplicate row by group in an R data frame?
To remove only the first duplicate row by group, we can use filter function of dplyr package with duplicated function.For example, if we have a data frame called df that contains a grouping column say Grp then removal of only first duplicate row by group can be done by using the below command as follows −df%>%group_by(Grp)%>%filter(duplicated(Grp)|n()==1)Example 1Following snippet creates a sample data frame −Group
Read MoreHow to sort an R data frame rows in alphabetical order?
If we have string data stored in R data frame columns then we might want to sort the data frame rows in alphabetical order. This can be done with the help of apply and sort function inside transpose function.For example, if we have a data frame called df that contains string data then sorting of df in alphabetical order can be done by using the below given command −t(apply(df,1,sort))Example 1Following snippet creates a sample data frame −x1
Read MoreHow to find the percentage of missing values in each column of an R data frame?
To find the percentage of missing values in each column of an R data frame, we can use colMeans function with is.na function. This will find the mean of missing values in each column. After that we can multiply the output with 100 to get the percentage.Check out the below given examples to understand how it can be done.Example 1Following snippet creates a sample data frame −x1
Read MoreHow to count the number of times a value occurs in a column of an R data frame?
To count the number of times a value occurs in a column of an R data frame, we can use table function for that particular column.For example, if we have a data frame called df that contains a column say Response then finding the number of times a value occurs in Response can be found by using the command given below −table(df$Response)Example 1Following snippet creates a sample data frame −x
Read MoreHow to add columns with square of each column in R data frame?
To add columns with square of each column in R data frame, we can use setNames function and cbind function for squaring each value. This might be required when we want to use squared form of variables in the data analysis.Check out the below given examples to understand how it can be done.Example 1Following snippet creates a sample data frame −x1
Read MoreHow to create boxplot of grouped data in R?
To create boxplot of grouped data in R, we would first need to convert the grouped data into complete data by repeating the values up to the frequency/count for each value and then use the boxplot function on the complete data.Check out the below example to understand how it can be done.ExampleFollowing snippet creates a sample data frame −Group
Read MoreHow to display mean with underline in base R plot?
To display mean value with underline in base R plot, we can use underline function within text function. The text function will be used to write the word Mean in the plot and underline function will underline the mean.Check out the below example to understand how it works.ExampleFollowing snippet creates a sample data frame −x
Read More