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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to find the absolute maximum of each group in R data frame?
To find the absolute maximum of each group in R data frame, we can follow the below steps −First of all, create a data frame.Then, use summarise_each function of dplyr package along with which.max and abs function to find the absolute maximum of each group after grouping with group_by.Example 1Create the data frameLet’s create a data frame as shown below −x
Read MoreHow to find the rank of each value in columns if some columns are categorical in R data frame?
To find the rank 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 rank of each value in columns if some columns are categorical.ExampleCreate the data frameLet’s create a data frame as shown below −Level
Read MoreHow to convert values in alternate rows to negative in R data frame column?
To convert values in alternate rows to negative in R data frame column, we can follow the below steps −First of all, create a data frame.Then, use vector multiplication with 1 and minus 1 to convert values in alternate rows to negative.ExampleCreate the data frameLet’s create a data frame as shown below −x
Read MoreHow to find the percent of NA's in R data frame rows?
To find the percent of NAs 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 and ncol function along with apply function to find the percent of NAs in each row of the data frameExampleCreate the data frameLet’s create a data frame as shown below −v1
Read MoreHow to change the sign of even number rows in an R data frame column?
To change the sign of even number rows in an R data frame column, we can follow the below steps −First of all, create a data frame.Then, use vector multiplication with 1 and minus 1 to change the sign of even number rows.ExampleCreate the data frameLet’s create a data frame as shown below −x
Read MoreHow to multiply row values in a data frame having multiple rows with single row data frame in R?
To multiply row values in a data frame having multiple rows with single row data frame in R, we can follow the below steps −First of all, create a data frame with multiple rows and a data frame with single row.Then, use mapply function to multiply row values in the data frame having multiple rows with single row data frame.ExampleCreate the first data frameLet’s create a data frame as shown below −x
Read MoreHow to find the row standard deviation of columns having same name in data.table object in R?
To find the row standard deviation 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 sd function to find the row standard deviation of columns having same name.ExampleCreate the data.table objectLet’s create a data.table object as shown below −library(data.table) DT
Read MoreHow to find the percentage of zeros in each column of a data frame in R?
To find the percentage of zeros in each column of a data frame in R, we can follow the below steps −First of all, create a data frame.Then, use colSums function along with nrow function to find the percentage of zeros in each column.Example 1Create the data frameLet’s create a data frame as shown below −x
Read MoreHow to multiply corresponding values from two data frames in R?
To multiply corresponding values from two data frames in R, we can follow the below steps −First of all, create two data frames.Then, use mapply function to multiply corresponding values from those two data frames.ExampleCreate the first data frameLet’s create a data frame as shown below −df1
Read MoreHow to create a column of first non-zero value in each row of an R data frame?
To create a column of first non-zero value in each row of an R data frame, we can follow the below steps −First of all, create a data frame with some zero values.Then, use apply function and a custom function to find the first non-zero in each row of the data frame.ExampleCreate the data frameLet’s create a data frame as shown below −x
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