R Programming Articles - Page 10 of 204

To delete repeated rows in xts object in R, we can follow the below steps −First of all, create an xts object.Then, use duplicated and index function to delete repeated rows.ExampleCreate the xts objectLet’s create an xts object as shown below −library(xts) T

To multiply single row matrix and a square matrix in R, we can follow the below steps −First of all, create the matrices.Then, use %*% to multiply those matrices.ExampleCreate the first matrixLet’s create a matrix as shown below −M1

To display square root sign in base R plot, we can follow the below steps −First of all, create a plot having square root values to display default visualisation.Then, create the plot with expression function to display square root sign in the plot.ExampleCreate plot in base RUsing plot function to create a plot in base R with square root values as shown below −x

To separate a specific text and the remaining text in data.table object column in R, we can follow the below steps −First of all, create a data.table object.Then, use str_split function from stringr package to separate first text value and the remaining text.ExampleCreate the data.table objectLet’s create a data.table object as shown below −library(data.table) Student_ID

To find the row total 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 sum function to find the row total of columns having same name.ExampleCreate the matrixLet’s create a matrix as shown below −M

To repeat a whole data frame in R, we can follow the below steps −First of all, create a data frame.Then, use rep function to repeat the data frame.ExampleCreate the data frameLet’s create a data frame as shown below −x

To remove rows that contain NAs in R matrix, we can follow the below steps −First of all, create a matrix.Then, use na.omit function to remove rows that contains NAs.ExampleCreate the matrixLet’s create a matrix as shown below −M

To display mean for each group in point chart using ggplot2 in R, we can follow the below steps −First of all, create a data frame.Then, use geom_point and geom_summary functions and provide mean for fun argument with different size and shape of the point for mean display.ExampleCreate the data frameLet’s create a data frame as shown below −grp

To remove double inverted commas in R vector, we can follow the below steps −First of all, create a vector.Then, use print function along with quote argument.Example 1Create the vectorLet’s create a vector as shown below −x1

To find the percentage of values that lie within a range in column of a data.table object in R, we can follow the below steps −First of all, create a data.table object.Then, use sum function along with extreme values for range and length function to find the percentage of values that lie within that range.ExampleCreate the data.table objectLet’s create a data.table object as shown below −library(data.table) x