The function results in the summation of the number of times a particular specified value occurs within the column. In this method, the sum() function is applied as a function over the elements of each column belonging to the data frame. This method can be used to calculate the frequency of the variable belonging to integer, character, or factor type class. The ldply() method of this package is used to apply a pre-defined function over each element of a list and then combine the results into a data frame. It can be downloaded and loaded into the workspace using the following command: install.packages("lpyr") The plyr package is used preferably to experiment with the data, that is, create, modify and delete the columns of the data frame, subjecting them to multiple conditions and user-defined functions. Creating a Data Frame from Vectors in R Programming.How to Replace specific values in column in R DataFrame ?.Clear the Console and the Environment in R Studio.Change column name of a given DataFrame in R.Adding elements in a vector in R programming – append() method.Taking Input from User in R Programming.Convert a Character Object to Integer in R Programming – as.integer() Function.Convert String to Integer in R Programming – strtoi() Function.Convert a Vector into Factor in R Programming – as.factor() Function.Convert Factor to Numeric and Numeric to Factor in R Programming.Convert a Data Frame into a Numeric Matrix in R Programming – data.matrix() Function.Finding Inverse of a Matrix in R Programming – inv() Function.Count the Frequency of elements in a Numeric Vector – tabulate() Function.Count the frequency of a variable per column in R Dataframe.ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.
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