Practical solutions

R Howtos How-To Guides

Solve the problem. Keep building. Collection of R how-to articles

Find the answer you need

Browse practical solutions, grouped by the task you're working on.

__COUNT__ entries on this page

R PlotHow to Change Point Size in Graphs in RThis tutorial introduces how to change the size and shape of points in graphs in R. R Data FrameHow to Replace NA With Zero in RIn this article, you will learn about two methods to replace NA values in a data frame with zero values. One of them uses the Base R subset reassigns, while the other is included in the dplyr package and runs up to 30% faster. R MemoryHow to Clear Memory in RIn this tutorial, you will learn how to clear memory taken by the R system without having to restart it or to restart the computer where it runs. R MatrixHow to Visualize Confusion Matrix Using Caret Package in RThis article introduces how to visualize confusion matrix using caret package in R R MatrixHow to Normalize the Values in Matrix RThis article demonstrates how to add a line to normalize the values in matrix R R Data FrameHow to Merge Two Data Frames With Different Number of Rows in RThis article introduces how to merge two data frames with different number of rows in R R Data FrameHow to Find Maximum Absolute Values by Row in Data Frame in RThis article demonstrates how to find maximum absolute values by row in data frame in R R PlotHow to Add Transparent Rectangle to Boxplot in RThis article introduces how to add tranparent rectangle to a boxplot in R R PlotHow to Add a Line to a Plot With the Lines() Function in RThis article demonstrates how to add a line to a plot with the lines() function in R R RegexHow to Use grepl to Find Matches for Any Character String in the R Character VectorThis article demonstrates how to use grepl find matches for any character string in the R character vector. R SeparateHow to Split Column Into Two Columns in RThis article demonstrates how to split a column into two columns using the separate function in R R Data FrameHow to Remove Duplicate Rows by Column in RThis article demonstrates how to remove duplicate rows by column in R R PlotHow to Draw Legend Items With Different Colors in RThis article introduces how to draw legend items with different colors in R R PlotHow to Create Side by Side Boxplots in RThis article introduces how to create side by side boxplots in R R PlotHow to Create Histogram With ggplot in RThis article introduces how to create a histogram with ggplot in R R PlotHow to Create Grouped Boxplots in RThis article introduces how to create grouped boxplots in R R PlotHow to Create Custom Legend With ggplot in RThis article introduces how to create custom legend with ggplot in R R StringHow to Remove the First Character From a String in RThis article demonstrates three techniques to remove the first character from a string or a vector of strings. It demonstrates the use of the substr function, the sub-function with a regular expression, and the str_sub function of the stringr package. R R-SquaredHow to Calculate the R-Squared Statistic in RThis article shows how to obtain the R-squared statistic in R from the summary of a linear regression model. It also shows how to calculate the R-squared statistic manually, both directly and by using a custom function. R ExportHow to Export a Data Frame From R to Microsoft ExcelThis article shows how to export a data frame from R to Microsoft Excel using the write.csv() function and functions provided by other packages. It also addresses problems that may occur in opening CSV files. R ProcessHow to Stop Running R Code With the Keyboard or MouseThis article shows how to stop running R code with the keyboard or mouse. R OperatorsHow to Drop Multiple Columns From a Data Frame Using DplyrThis article shows how to drop multiple columns from a data frame using dplyr. The example code demonstrates the use of different selection helper functions and operators to drop multiple columns with a single line of code. R PackageHow to Install R Packages From SourceThis article shows how to use the install.packages() function to install R packages from source. It points out the two conditions that need to be met for the installation from source to be successful. R VectorizedHow to Use Vectorized if Function With Multiple Conditions in RThis article shows how to use multiple conditions in the vectorized ifelse and if_else functions in creating or updating a column in a data frame. It also draws attention to the vectorized AND and OR operators.