cell_values: Retrieve cell values by row and column path

In rtables: Reporting Tables

Retrieve cell values by row and column path

Description

Retrieve cell values by row and column path

Usage

cell_values(tt, rowpath = NULL, colpath = NULL, omit_labrows = TRUE)

value_at(tt, rowpath = NULL, colpath = NULL)

## S4 method for signature 'VTableTree'
value_at(tt, rowpath = NULL, colpath = NULL)

Arguments

tt	(TableTree or related class) a TableTree object representing a populated table.
rowpath	(character) path in row-split space to the desired row(s). Can include "@content".
colpath	(character) path in column-split space to the desired column(s). Can include "*".
omit_labrows	(flag) whether label rows underneath rowpath should be omitted (TRUE, the default), or return empty lists of cell "values" (FALSE).

Value

• cell_values returns a list (regardless of the type of value the cells hold). If rowpath defines a path to a single row, cell_values returns the list of cell values for that row, otherwise a list of such lists, one for each row captured underneath rowpath. This occurs after subsetting to colpath has occurred.

• value_at returns the "unwrapped" value of a single cell, or an error, if the combination of rowpath and colpath do not define the location of a single cell in tt.

Note

cell_values will return a single cell's value wrapped in a list. Use value_at to receive the "bare" cell value.

Examples

lyt <- basic_table() %>%
  split_cols_by("ARM") %>%
  split_cols_by("SEX") %>%
  split_rows_by("RACE") %>%
  summarize_row_groups() %>%
  split_rows_by("STRATA1") %>%
  analyze("AGE")


library(dplyr) ## for mutate
tbl <- build_table(lyt, DM %>%
  mutate(SEX = droplevels(SEX), RACE = droplevels(RACE)))

row_paths_summary(tbl)
col_paths_summary(tbl)

cell_values(
  tbl, c("RACE", "ASIAN", "STRATA1", "B"),
  c("ARM", "A: Drug X", "SEX", "F")
)

# it's also possible to access multiple values by being less specific
cell_values(
  tbl, c("RACE", "ASIAN", "STRATA1"),
  c("ARM", "A: Drug X", "SEX", "F")
)
cell_values(tbl, c("RACE", "ASIAN"), c("ARM", "A: Drug X", "SEX", "M"))

## any arm, male columns from the ASIAN content (i.e. summary) row
cell_values(
  tbl, c("RACE", "ASIAN", "@content"),
  c("ARM", "B: Placebo", "SEX", "M")
)
cell_values(
  tbl, c("RACE", "ASIAN", "@content"),
  c("ARM", "*", "SEX", "M")
)

## all columns
cell_values(tbl, c("RACE", "ASIAN", "STRATA1", "B"))

## all columns for the Combination arm
cell_values(
  tbl, c("RACE", "ASIAN", "STRATA1", "B"),
  c("ARM", "C: Combination")
)

cvlist <- cell_values(
  tbl, c("RACE", "ASIAN", "STRATA1", "B", "AGE", "Mean"),
  c("ARM", "B: Placebo", "SEX", "M")
)
cvnolist <- value_at(
  tbl, c("RACE", "ASIAN", "STRATA1", "B", "AGE", "Mean"),
  c("ARM", "B: Placebo", "SEX", "M")
)
stopifnot(identical(cvlist[[1]], cvnolist))

rtables documentation built on Sept. 30, 2024, 9:32 a.m.