Create a cell array as in MATLAB.
Examples
cell(3)
#> [,1] [,2] [,3]
#> [1,] numeric,0 numeric,0 numeric,0
#> [2,] numeric,0 numeric,0 numeric,0
#> [3,] numeric,0 numeric,0 numeric,0
cell(2,3)
#> [,1] [,2] [,3]
#> [1,] numeric,0 numeric,0 numeric,0
#> [2,] numeric,0 numeric,0 numeric,0
## define possible values of 2 categorical design variable
x.space <- cell(1,2)
x.space[1,1] <- list(seq(10,100,10))
x.space[1,2] <- list(seq(10,300,10))
x.space
#> [,1] [,2]
#> [1,] numeric,10 numeric,30
x.space[1,1]
#> [[1]]
#> [1] 10 20 30 40 50 60 70 80 90 100
#>
x.space[1,2]
#> [[1]]
#> [1] 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190
#> [20] 200 210 220 230 240 250 260 270 280 290 300
#>