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Add rows to a FreeSurfer LUT

Source: R/read_write.R
lut_add.Rd

Append custom label entries to a LUT (as read by read_lut()). Scalar inputs are recycled to the length of idx. Useful for adding custom subregion labels (e.g. hemisphere-prefixed or split structures) before passing the table to create_subcortical_from_volume().

Usage

lut_add(lut, idx, label, R, G, B, A = 0L)

Arguments

lut

A LUT data.frame (passes is_lut()).

idx

Integer label indices to add.

label

Character region labels.

R, G, B, A

Integer colour channels (0-255); A defaults to 0.

Value

lut with the new rows appended (a type column, if present, is filled with NA for the new rows).

See also

read_lut(), lut_combine()

Examples

ct <- data.frame(
  idx = 0L, label = "Unknown", R = 0L, G = 0L, B = 0L, A = 0L
)
lut_add(ct, idx = 20001:20002,
        label = c("Left-Hippocampus-ant", "Left-Hippocampus-post"),
        R = c(220, 60), G = c(190, 140), B = c(30, 200))
#>     idx                 label   R   G   B A
#> 1     0               Unknown   0   0   0 0
#> 2 20001  Left-Hippocampus-ant 220 190  30 0
#> 3 20002 Left-Hippocampus-post  60 140 200 0