scidb (version 1.1-2)

antijoin: antijoin

Description

Given two SciDB arrays of same dimensionality, return any coordinates that do NOT join.

Usage

antijoin( array1, array2 )

Arguments

array1

a scidb array or scidbdf data frame object.

array2

a scidb array or scidbdf data frame object.

Value

• NULL is returned when the two arrays join in all coordinates. Otherwise, a scidb array is returned such that for all coordinates, the single attribute shall equal to 1 if those coordinates exist only in array1, or 2 if those coordinates exist only in array2.

See Also

scidb

Examples

set.seed(1)
# Generate sparse SciDB arrays
a <- as.scidb(Matrix::sparseMatrix(
               sample(10,100,replace=TRUE),sample(10,100,replace=TRUE),x=runif(100)))
b <- as.scidb(Matrix::sparseMatrix(
               sample(10,100,replace=TRUE),sample(10,100,replace=TRUE),x=runif(100)))
antijoin(a,b)[]

# Output looks like:
# [1,] 2 . . 1 2 1 . . . 2
# [2,] 2 . 2 2 2 1 1 1 2 2
# [3,] 2 . . 2 . 2 . . . 1
# [4,] . 2 1 . . . . 1 . 2
# [5,] . . . . . 1 . . . 2
# [6,] 1 2 . . 2 2 . 1 . 2
# [7,] . 1 . 1 . 1 . 1 . 1
# [8,] 2 . 1 . 1 1 1 . . .
# [9,] 2 . 1 . 2 . . 2 1 .
#[10,] 2 . . . 2 . 2 2 . .