Combine row, column, and layer numbers
rcl.RdGet a matrix with the combination of row, column, and layer numbers
Arguments
- x
SpatRaster
- row
positive integer that are row number(s), a list thereof, or NULL for all rows
- col
as above for columns
- lyr
as above for layers
Details
If a list is used for at least one of row, col or lyr, these are evaluated in parallel. That is combinations are made for each list element, not across list elements. If, in this case another argument is not a list it has to have either length 1 (used for all cases) or have the same length as the (longest) list, in which case the value is coerced into a list with as.list
If multiple arguments are a list but they have different lengths, theyare recycled to the longest list.
Examples
x <- rast(ncol=5, nrow=5, nlyr=2)
values(x) <- 1:size(x)
rcl(x, 1, 2:3, 1:2)
#> row col lyr
#> [1,] 1 2 1
#> [2,] 1 3 1
#> [3,] 1 2 2
#> [4,] 1 3 2
i <- rcl(x, 1, list(1:2, 3:4), 1:2)
i
#> row col lyr
#> [1,] 1 1 1
#> [2,] 1 2 1
#> [3,] 1 3 2
#> [4,] 1 4 2
# get the values for these cells
x[i]
#> [1] 1 2 28 29