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Nizamuddin Siddiqui has Published 2307 Articles
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Nizamuddin Siddiqui
3K+ Views
To update single value in an R data frame, we can use row and column indices with single square brackets.For example, if we have a data frame called df that contains two columns and ten rows and if we want to change the fifth value in second column to 10 ... Read More
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Nizamuddin Siddiqui
2K+ Views
The coordinate of a value in an R matrix is the row and column intersection that is the row and column index for that particular value. This can be found by using which function.For example, if we have a matrix called M that contains value starting from 1 to 20 ... Read More
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Nizamuddin Siddiqui
2K+ Views
To fill missing values after merging the data frames with another value than NA in R, we can follow the below steps −First of all, create two data frames.Then, merge the data frames by a common column between the two.After that, replace the NAs with another value.ExampleCreate the first data ... Read More
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Nizamuddin Siddiqui
701 Views
To use top_n function from dplyr to extract rows based on one column ordered indescending order in R, we can follow the below steps −First of all, create a data frame.Then, use top_n function dplyr package along with arrange and desc function to extract rows based on one column ordered ... Read More
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Nizamuddin Siddiqui
180 Views
To create quantile regression plot with larger width of lines using ggplot2 in R, we can follow the below steps −First of all, create a data frame.Then, use stat_quantile function with size argument and geom_point function of ggplot2 package to create quantile regression plot.ExampleCreate the data frameLet’s create a data ... Read More
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Nizamuddin Siddiqui
92 Views
To subset a matrix in R by specifying columns that contains NA, we can follow the below steps −First of all, create a matrix with some NAs.Then, use is.na along with subset function to subset the matrix by specifying columns that contains NA.ExampleCreate the matrixLet’s create a matrix as shown ... Read More
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Nizamuddin Siddiqui
1K+ Views
To remove a row from matrix in R by using its name, we can follow the below steps −First of all, create a matrix.Then, add names to rows of the matrix.After that, subset the matrix by deselecting the desired row with negation and single square brackets for subsetting.ExampleCreate the matrixLet’s ... Read More
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Nizamuddin Siddiqui
5K+ Views
To remove a column from matrix in R by using its name, we can follow the below steps −First of all, create a matrixThen, add names to columns of the matrix.After that, subset the matrix by deselecting the desired column with negation and single square brackets for subsetting.ExampleCreate the matrixLet’s ... Read More
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Nizamuddin Siddiqui
121 Views
To find the row total 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 sum function to find the row total of columns having same ... Read More
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Nizamuddin Siddiqui
989 Views
To extract the last n values of all elements of a list in R, we can follow the below steps −First of all, create a list.Then, use tail function with sapply function to extract the last n values of all elements in the list.Example 1Create the listLet’s create a list ... Read More