Found 2003 Questions for R Programming

How to create a column with column name for maximum value in each row of an R data frame?

Nizamuddin Siddiqui
Updated on 15-Nov-2021 07:14:41
To create a column with column name for maximum value in each row of an R data frame, we can follow the below steps −First of all, create a data frame.Then, use mutate function of dplyr package along with max.col function to create a column with column name for maximum value in each row of an R data frame.ExampleCreate the data frameLet’s create a data frame as shown below −x

How to find the row variance of columns having same name in data.table object in R?

Nizamuddin Siddiqui
Updated on 15-Nov-2021 07:11:47
To find the row variance of columns having same name in data.table object in R, we can follow the below steps −First of all, create a data.table object with some columns having same name.Then, use tapply along with colnames and var function to find the row variance of columns having same name.ExampleCreate the data.table objectLet’s create a data.table object as shown below −library(data.table) DT

How to find the row means in data.table object for columns having same name in R?

Nizamuddin Siddiqui
Updated on 15-Nov-2021 07:07:12
To find the row mean of columns having same name in R data.table, 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 mean function to find the row mean of columns having same name.ExampleCreate the data.tableLet’s create a data.table as shown below −library(data.table) DT

How to find the row standard deviation of columns having same name in R matrix?

Nizamuddin Siddiqui
Updated on 15-Nov-2021 07:03:52
To find the row standard deviation of columns having same name in R matrix, we can follow the below steps −First of all, create a matrix with some columns having same name.Then, use tapply along with colnames and sd function to find the row standard deviation of columns having same name.ExampleCreate the matrixLet’s create a matrix as shown below −M

How to find the row means of columns having same name in R matrix?

Nizamuddin Siddiqui
Updated on 15-Nov-2021 06:56:45
To find the row mean of columns having same name in R matrix, we can follow the below steps −First of all, create a matrix with some columns having same name.Then, use tapply along with colnames and mean function to find the row mean of columns having same name.ExampleCreate the matrixLet’s create a matrix as shown below −M

How to find the row mean of columns having same name in R data frame?

Nizamuddin Siddiqui
Updated on 15-Nov-2021 06:52:01
To find the row mean of columns having same name in R data frame, we can follow the below steps −First of all, create a data frame with some columns having same name.Then, use tapply along with colnames and mean function to find the row mean of columns having same name.ExampleCreate the data frameLet’s create a data frame as shown below −df

How to find the sin of each value in columns if some columns are categorical in R data frame?

Nizamuddin Siddiqui
Updated on 15-Nov-2021 06:48:19
To find the sin of each value in columns if some columns are categorical in R data frame, we can follow the below steps −First of all, create a data frame.Then, use numcolwise function from plyr package to find the sin of each value in columns if some columns are categorical.ExampleCreate the data frameLet’s create a data frame as shown below −Level

How to convert values in alternate rows to negative in matrix in R?

Nizamuddin Siddiqui
Updated on 15-Nov-2021 06:45:04
To convert values in alternate rows to negative R matrix, we can follow the below steps −First of all, create a matrix.Then, use vector multiplication with 1 and minus 1 to convert values in alternate rows to negative.ExampleCreate the matrixLet’s create a matrix as shown below −M

How to convert values in alternate rows to negative in data.table object in R?

Nizamuddin Siddiqui
Updated on 15-Nov-2021 06:32:19
To convert values in alternate rows to negative in data.table object in R, we can follow the below steps −First of all, create a data.table object.Then, use vector multiplication with 1 and minus 1 to convert values in alternate rows to negative.ExampleCreate the data.table objectLet’s create a data.table object as shown below −library(data.table) x

How to remove hyphen at last position from every value in R data frame column?

Nizamuddin Siddiqui
Updated on 15-Nov-2021 06:29:54
To remove hyphen at last position from every value in R data frame column, we can follow the below steps −First of all, create a data frame with a column having hyphen at last position in every value.Then, use gsub function to remove hyphen at last position from every value in the column.ExampleCreate the data frameLet’s create a data frame as shown below −x
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