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R Programming Articles
Page 111 of 174
How to multiply corresponding row values in a matrix with single row matrix in R?
To multiply row values in a matrix having multiple rows with single row matrix in R, we can follow the below steps −First of all, create a matrix with multiple rows and a matrix with single row.Then, use mapply function to multiply row values in those matrices.ExampleCreate the first matrixLet’s create a matrix as shown below −M1
Read MoreCheck which column names contain a specific string in R data frame.
If we have a data frame that contains columns having names with some commong strings then we might want to find those column names. For this purpose, we can use grepl function for subsetting along with colnames function.Check out the Examples given below to understand how it can be done.Example 1Following snippet creates a sample data frame −Students_Score
Read MoreHow to find the number of zeros in each row of an R data frame?
To find the number of zeros in each row of an R data frame, we can follow the below steps −First of all, create a data frame.Then, use rowSums function to find the number of zeros in each row of the data frame.ExampleCreate the data frameLet’s create a data frame as shown below −x
Read MoreHow to create pivot table with sum for data stored in R data frame?
To create pivot table with sum for data stored in R data frame, we can follow the below steps −First of all, create a data frame with two categorical and one numerical column.Then, use dcast function from reshape2 package to create pivot table for the data stored in data frame.ExampleCreate the data frameLet’s create a data frame as shown below −Group
Read MoreChange the starting point of bars in bar plot for a ggplot2 graph in R.
To change the starting point of bars in bar plot for a ggplot2 graph in R, we can use coord_cartesian function of ggplot2 package with ylim argument where we can change the starting and ending point for the bar plot values.Check out the Example given below to understand how it can be done.ExampleFollowing snippet creates a sample data frame −x
Read MoreHow to increase the length of Y-axis values for ggplot2 graph in R?
To increase the length of Y-axis for ggplot2 graph in R, we can use scale_y_continuous function with limits argument.For Example, if we have a data frame called df that contains two columns say X and Y and we want to have the length of Y-axis starting from 1 to 10 by using the below mentioned command −ggplot(df,aes(X,Y))+geom_point()+scale_y_continuous(limits=c(1,10))ExampleFollowing snippet creates a sample data frame −x
Read MoreHow to separate two values in single column in R data frame?
To separate two values in single column in R data frame, we can follow the below steps −First of all, create a data frame.Then, use separate function from tidyr package to separate the values in single column.ExampleCreate the data frameLet’s create a data frame as shown below −df
Read MoreHow to convert first letter into capital in single column R data frame using a function?
To convert first letter into capital in single column data frame in R, we can follow the below steps −First of all, create a data frame with string column.Then, use capitalize function from R.utils package to convert first letter into capital in single column.ExampleCreate the data frameLet’s create a data frame as shown below −Names
Read MoreFind the frequency of unique values for each column in an R data frame.
To find the frequency of unique values for each column in an R data frame, we can use apply function with table function.For Example, if we have a data frame called df then we can find the frequency of unique values for each column in df by using the below mentioned command −apply(df,2,table)Example 1Following snippet creates a sample data frame −x1
Read MoreHow to find the row median of columns having same name in data.table object in R?
To find the row median of columns having same name in data.table object in R, we can follow the below steps −First of all, create a data.table with some columns having same name.Then, use tapply along with colnames and median function to find the row median of columns having same name.ExampleCreate the data.tableLet’s create a data.table as shown below −library(data.table) DT
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