matlab2r (version 1.5.0)

ismember: Array elements that are members of set array

Description

Checks which members of one entity are in another

Usage

ismember(A, B, rows = FALSE, indices = FALSE)
# S4 method for data.frame,data.frame
ismember(A, B, rows = FALSE, indices = FALSE)

Value

a binary vector telling if the corresponding A indices are in B. If indices = TRUE, also prints the index in B where the match first occurs.

Arguments

A

a vector, matrix or dataframe

B

another vector, matrix or dataframe

rows

if TRUE, each row of A and each row of B are treated as single entities

indices

if TRUE, outputs the lowest B index for each match in A

Author

Waldir Leoncio

Examples

# Values that are members of set
A <- c(5, 3, 4, 2)
B <- c(2, 4, 4, 4, 6, 8)
ismember(A, B)

# Members of set and indices to values
ismember(A, B, indices = TRUE)

# Table rows found in another table
A <- data.frame(
 "V1" = 1:5, "V2" = LETTERS[1:5], "V3" = as.logical(c(0, 1, 0, 1, 0))
)
B <- data.frame(
 "V1" = seq(1, 9, 2), "V2" = LETTERS[seq(1, 9, 2)], "V3" = as.logical(rep(0, 5))
)
ismember(A, B)