brackets {rtables}

Retrieve and assign elements of a TableTree

Description

Retrieve and assign elements of a TableTree

Usage

## S4 replacement method for signature 'VTableTree,ANY,ANY,list'
x[i, j, ...] <- value

## S4 method for signature 'VTableTree,logical,logical'
x[i, j, ..., drop = FALSE]

Arguments

x

(TableTree)
a TableTree object.

i

(numeric(1))
index.

j

(numeric(1))
index.

...

additional arguments. Includes:

keep_topleft

(flag) ([ only) whether the top-left material for the table should be retained after subsetting. Defaults to TRUE if all rows are included (i.e. subsetting was by column), and drops it otherwise.

keep_titles

(flag) whether title information should be retained. Defaults to FALSE.

keep_footers

(flag) whether non-referential footer information should be retained. Defaults to keep_titles.

reindex_refs

(flag) whether referential footnotes should be re-indexed as if the resulting subset is the entire table. Defaults to TRUE.

value

(list, TableRow, or TableTree)
replacement value.

drop

(flag)
whether the value in the cell should be returned if one cell is selected by the combination of i and j. It is not possible to return a vector of values. To do so please consider using cell_values(). Defaults to FALSE.

Details

By default, subsetting drops the information about title, subtitle, main footer, provenance footer, and topleft. If only a column is selected and all rows are kept, the topleft information remains as default. Any referential footnote is kept whenever the subset table contains the referenced element.

Value

A TableTree (or ElementaryTable) object, unless a single cell was selected with drop = TRUE, in which case the (possibly multi-valued) fully stripped raw value of the selected cell.

Note

Subsetting always preserve the original order, even if provided indexes do not preserve it. If sorting is needed, please consider using sort_at_path(). Also note that character indices are treated as paths, not vectors of names in both [ and ⁠[<-⁠.

See Also

• sort_at_path() to understand sorting.

• summarize_row_groups() to understand path structure.

Examples

lyt <- basic_table(
  title = "Title",
  subtitles = c("Sub", "titles"),
  prov_footer = "prov footer",
  main_footer = "main footer"
) %>%
  split_cols_by("ARM") %>%
  split_rows_by("SEX") %>%
  analyze(c("AGE"))

tbl <- build_table(lyt, DM)
top_left(tbl) <- "Info"
tbl

# As default header, footer, and topleft information is lost
tbl[1, ]
tbl[1:2, 2]

# Also boolean filters can work
tbl[, c(FALSE, TRUE, FALSE)]

# If drop = TRUE, the content values are directly retrieved
tbl[2, 1]
tbl[2, 1, drop = TRUE]

# Drop works also if vectors are selected, but not matrices
tbl[, 1, drop = TRUE]
tbl[2, , drop = TRUE]
tbl[1, 1, drop = TRUE] # NULL because it is a label row
tbl[2, 1:2, drop = TRUE] # vectors can be returned only with cell_values()
tbl[1:2, 1:2, drop = TRUE] # no dropping because it is a matrix

# If all rows are selected, topleft is kept by default
tbl[, 2]
tbl[, 1]

# It is possible to deselect values
tbl[-2, ]
tbl[, -1]

# Values can be reassigned
tbl[2, 1] <- rcell(999)
tbl[2, ] <- list(rrow("FFF", 888, 666, 777))
tbl[6, ] <- list(-111, -222, -333)
tbl

# We can keep some information from the original table if we need
tbl[1, 2, keep_titles = TRUE]
tbl[1, 2, keep_footers = TRUE, keep_titles = FALSE]
tbl[1, 2, keep_footers = FALSE, keep_titles = TRUE]
tbl[1, 2, keep_footers = TRUE]
tbl[1, 2, keep_topleft = TRUE]

# Keeps the referential footnotes when subset contains them
fnotes_at_path(tbl, rowpath = c("SEX", "M", "AGE", "Mean")) <- "important"
tbl[4, 1]
tbl[2, 1] # None present

# We can reindex referential footnotes, so that the new table does not depend
#  on the original one
fnotes_at_path(tbl, rowpath = c("SEX", "U", "AGE", "Mean")) <- "important"
tbl[, 1] # both present
tbl[5:6, 1] # {1} because it has been indexed again
tbl[5:6, 1, reindex_refs = FALSE] # {2} -> not reindexed

# Note that order can not be changed with subsetting
tbl[c(4, 3, 1), c(3, 1)] # It preserves order and wanted selection