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R Programming Articles
Page 139 of 174
Combine values of two columns separated with hyphen in an R data frame.
To combine values of two columns separated with hyphen in an R data frame, we can use apply function.For Example, if we have a data frame called df that contains only two columns say X and Y then we can combine the values in X and Y by using the below command given below −df$X_Y
Read MoreHow to find the class of columns of an R data frame?
To find the class of columns of an R data frame, we can use class function along with sapply and as.data.frame function.For Example, if we have a data frame called DF then we can find the class of columns in DF by using the command as follows −data.frame(sapply(DF, class))Example 1Consider the below data frame −head(mtcars, 20) The following dataframe is created mpg cyl disp hp drat wt qsec vs am gear carb Mazda RX4 21.0 6 160.0 110 3.90 ...
Read MoreHow to check which list element contains a particular value in R?
A list in R can have large number of elements and also of different types. If we have a list that contain vectors and we want to check which list element contains a particular value then we can use which function along with sapply function.For Example, if we have a list called LIST then we can find which element of LIST contains 5 then we can use the command given below −which(sapply(LIST, FUN=function(X) 5 %in% X))Example 1Consider the List given below −List1
Read MoreHow to convert strings in R data frame to unique integers?
To convert strings in R data frame to unique integers, we first need to extract the unique strings in the data frame and then read them inside data.frame function with as.numeric along with factor function.Check out the below Examples to understand how it works.Example 1Consider the below data frame −x1
Read MoreCreate a date column in R using a date vector excluding weekends.
If we have a vector of dates that contains all days in a week then we can use that vector to create a date column by excluding weekends with the help of subsetting the vector as shown in the below Examples. After subsetting the vector, we will just need to pass the vector in data.frame function.Example 1Consider the below vector of dates −x
Read MoreHow to change the border line type in base R boxplot?
The default boxplot in R has straight border line type that display end point(s) excluding outliers. To change these border lines from a boxplot, we can use staplelty argument.For Example, if we have a vector called X then we can create the boxplot of X with different border line type by using the command boxplot(X,staplelty=15). The argument can take different values. Check out the below Examples to understand how it works.ExampleConsider the below vector −x
Read MoreHow to change the whisker line type in base R boxplot?
The default boxplot in R has dotted whisker lines and if we want to change it to something else, we can use the whisklty argument.For Example, if we have a vector called X then we can create the boxplot of X with different whisker line by using the command boxplot(X,whisklty=1). The argument can take different values.Check out the Examples given below to understand how it works.ExampleConsider the vector given below −x
Read MoreCreate a number vector in R with initial values as zero by defining the maximum digits for each value.
To create a number vector in R with initial values as zero by defining the maximum digits for each value, we can use sprintf function.For Example, if we want to create a number vector having values starting from 1 to 100 and we want to have 1 as 001 and so on then, we can use the below command −sprintf('%0.3d',1:100)ExampleFollowing snippet creates a sample data frame −x1
Read MoreHow to remove end lines from a boxplot in R?
The default boxplot in R has straight lines that display end point(s) excluding outliers. To remove these end lines from a boxplot, we can use staplelty argument and set it to 0.For Example, if we have a vector called X then we can create the boxplot of X by using the command given below −boxplot(X,staplelty=0)ExampleFollowing snippet creates a sample data frame −x
Read MoreHow to check if a data frame has any missing value in R?
To check if a data frame has any missing value in R, we can use any function along with is.na function. For Example, if we have a data frame called df then we can use the below command to check whether df contains any missing value or notany(is.na(df))Example 1Following snippet creates a sample data frame −x1
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