match: Match Data Frame Rows

In TobieSurette/gulf.utils: Southern Gulf of Saint Lawrence Utility Functions

Match Data Frame Rows

Description

Returns the row indices of a target data frame which match those of a source data frame.

Usage

match(x, ...)

## Default S3 method:
match(x, ...)

## S3 method for class 'data.frame'
match(x, y, by, key, ...)

Arguments

x	Source data frame whose elements will be searched for in the target data frame y.
...	Further arguments passed onto match.
y	Target data frame.
by	Column name(s) which will be used for matching elements. The default is the common column names for x and y.
key	Character vector defining index key.

Methods (by class)

• match(default): Default match method, see match.

• match(data.frame): Match rows between two data frames.

Examples

# Create a simple data frame:
x <- data.frame(
        u = c(2, 2, 4),
        v = c(1, 2, 3))

y <- data.frame(
        u = c(1, 1, 1, 1, 2, 2, 2, 3),
        v = c(1, 2, 3, 4, 1, 2, 3, 3))

# Get the list of indices matching the rows of 'x' to 'y':
index <- match(x, y)

TobieSurette/gulf.utils documentation built on Dec. 1, 2024, 6:01 a.m.