Merge Two Data Frames by common Columns in R Programming - merge() Function Last Updated : 12 Jun, 2020 Comments Improve Suggest changes Like Article Like Report merge() function in R Language is used to merge two data frames by common columns. Syntax: merge(arg1, arg2, by.x, by.y) Parameters: arg1 and arg2: Data frames to be merged by.x: Common argument of first data frame by.y: Common argument of second data frame Example 1: Python3 1== # R program to merge two data frames # Creating data frames df1 <- data.frame(row1 = c("a", "b", "c"), row2 = c("d", "e", "f")) df2 <- data.frame(col1 = c("a", "b", "c"), col2 = c("Hello", "Geeks", "gfg")) # Calling merge() function df <- merge(df1, df2, by.x ="row1", by.y ="col1") print(df) Output: row1 row2 col2 1 a d Hello 2 b e Geeks 3 c f gfg Example 2: Python3 1== # R program to merge two data frames # Creating data frames df1 <- data.frame(row1 = c("d", "e", "f"), row2 = c(1, 2, 3)) df2 <- data.frame(col1 = c(1, 2, 3), col2 = c("Hello", "Geeks", "gfg")) # Calling merge() function df <- merge(df1, df2, by.x ="row2", by.y ="col1") print(df) Output: row2 row1 col2 1 1 d Hello 2 2 e Geeks 3 3 f gfg Comment More infoAdvertise with us Next Article Merge Two Data Frames by common Columns in R Programming - merge() Function N nidhi_biet Follow Improve Article Tags : R Language R DataFrame-Function Similar Reads Combine Vectors, Matrix or Data Frames by Columns in R Language - cbind() Function cbind() function in R Language is used to combine specified Vector, Matrix or Data Frame by columns. Syntax: cbind(x1, x2, ..., deparse.level = 1) Parameters: x1, x2: vector, matrix, data frames deparse.level: This value determines how the column names generated. The default value of deparse.level i 2 min read Condense Column Values of a Data Frame in R Programming - summarise() Function summarise() function in R Language is used to condense various values of column of a data frame to one value. Syntax: summarise(x, expr) Parameters: x: Data Frame expr: Operation to condense data Example 1: Python3 1== # R program to condense data # of a data frame # Loading library library(dplyr) # 1 min read Convert an Object to Data Frame in R Programming - as.data.frame() Function as.data.frame() function in R Programming Language is used to convert an object to data frame. These objects can be Vectors, Lists, Matrices, and Factors. Syntax: as.data.frame(object) Parameters: object: Vector, Matrix, factor, or data frameR - as.data.frame() Function ExampleExample 1: Basic exam 2 min read Convert a Data Frame into a Molten Form in R Programming - melt() Function function in R Language is used to combine multiple columns of s Data Frame into a single column. Syntax: melt(x, na.rm, value.name) Parameters: x: data to be melted na.rm: Boolean value to remove NA value.name: Setting column names Example 1: Python3 1== # R program to reshape data frame # Loading l 2 min read How to Merge DataFrames Based on Multiple Columns in R? In this article, we will discuss how to merge dataframes based on multiple columns in R Programming Language. We can merge two  dataframes based on multiple columns  by using merge() function Syntax: merge(dataframe1, dataframe2, by.x=c('column1', 'column2'...........,'column n'), by.y=c('column1', 2 min read Like