Merge By Column R

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Merge By Column R
merge {base}R Documentation

Rbind Function Works When Column Names Are Exactly the Same with R Incorporate df3 With a successful binding of df1 and df2, R automatically knows to bind the right columns together. Merge is a generic function in base R. It dispatches to either the merge.data.frame method or merge.data.table method depending on the class of its first argument. Note that, unlike SQL, NA is matched against NA (and NaN against NaN) while merging. In versions columns in by were not the key (or head of the key) of x or y, then a copy is first re-keyed. By default the data frames are merged on the columns with names they both have, but separate specifcations of the columns can be given by by.xand by.y. Columns can be specified by name, number or by a logical vector: the name 'row.names'or the number.

Merge Two Data Frames

Description

Merge two data frames by common columns or row names.

Usage

Arguments

x, y data frames, or objects to be coerced to one
by, by.x, by.y specifcations of the common columns. See Details.
sort logical. Should the results be sorted on the by columns?

Details

By default the data frames are merged on the columns with names they both have, but separate specifcations of the columns can be given by by.x and by.y. Columns can be specified by name, number or by a logical vector: the name 'row.names' or the number 0 specifies the row names. The rows in the two data frames that match on the specified columns are extracted, and joined together. If there is more than one match, all possible matches contribute one row each.

If the remaining columns in the data frames have any common names, these have '.x' and '.y' appended to make the names of the result unique.

Value

Merge By Column Rule

A data frame. The rows are by default lexicographically sorted on the common columns, but are otherwise in the order in which they occurred in x. The columns are the common columns followed by the remaining columns in x and then those in y. If the matching involved row names, an extra column Row.names is added at the left, and in all cases the result has no special row names.

See Also

R Merge By Column Name

data.frame, by, cbind

Examples

Merge By Column Roblox