Plus-minus operator

Usage

a %+-% b

Arguments

a, b: numeric vectors, matrices or arrays

Value

a +/- b, the dimension depends on a+b. If a+b is a scalar, returns a vector of two; in the case of vector, returns a matrix; all other cases will return an array with the last dimension equal to 2.

Examples


# scalar
1 %+-% 2   # -1, 3
#> [1]  3 -1

# vector input
c(1,2,3) %+-% 2   # matrix
#>      [,1] [,2]
#> [1,]    3   -1
#> [2,]    4    0
#> [3,]    5    1

# matrix input
matrix(1:9, 3) %+-% 2   # 3x3x2 array
#> , , 1
#> 
#>      [,1] [,2] [,3]
#> [1,]    3    6    9
#> [2,]    4    7   10
#> [3,]    5    8   11
#> 
#> , , 2
#> 
#>      [,1] [,2] [,3]
#> [1,]   -1    2    5
#> [2,]    0    3    6
#> [3,]    1    4    7
#>