tern (version 0.9.8)

rtables_access: Helper functions for accessing information from rtables

Description

These are a couple of functions that help with accessing the data in rtables objects. Currently these work for occurrence tables, which are defined as having a count as the first element and a fraction as the second element in each cell.

Usage

h_row_first_values(table_row, col_names = NULL, col_indices = NULL)
h_row_counts(table_row, col_names = NULL, col_indices = NULL)
h_row_fractions(table_row, col_names = NULL, col_indices = NULL)
h_col_counts(table, col_names = NULL, col_indices = NULL)
h_content_first_row(table)
is_leaf_table(table)
check_names_indices(table_row, col_names = NULL, col_indices = NULL)

Value

• h_row_first_values() returns a vector of numeric values.

• h_row_counts() returns a vector of numeric values.

• h_row_fractions() returns a vector of proportions.

• h_col_counts() returns a vector of column counts.

• h_content_first_row() returns a row from an rtables table.

• is_leaf_table() returns a logical value indicating whether current table is a leaf.

• check_names_indices returns column indices.

Arguments

table_row

(TableRow)
an analysis row in a occurrence table.

col_names

(character)
the names of the columns to extract from.

col_indices

(integer)
the indices of the columns to extract from. If col_names are provided, then these are inferred from the names of table_row. Note that this currently only works well with a single column split.

table

(VTableNodeInfo)
an occurrence table or row.

Functions

• h_row_first_values(): Helper function to extract the first values from each content cell and from specified columns in a TableRow. Defaults to all columns.

• h_row_counts(): Helper function that extracts row values and checks if they are convertible to integers (integerish values).

• h_row_fractions(): Helper function to extract fractions from specified columns in a TableRow. More specifically it extracts the second values from each content cell and checks it is a fraction.

• h_col_counts(): Helper function to extract column counts from specified columns in a table.

• h_content_first_row(): Helper function to get first row of content table of current table.

• is_leaf_table(): Helper function which says whether current table is a leaf in the tree.

• check_names_indices(): Internal helper function that tests standard inputs for column indices.

See Also

prune_occurrences for usage of these functions.

Examples

tbl <- basic_table() %>%
  split_cols_by("ARM") %>%
  split_rows_by("RACE") %>%
  analyze("AGE", function(x) {
    list(
      "mean (sd)" = rcell(c(mean(x), sd(x)), format = "xx.x (xx.x)"),
      "n" = length(x),
      "frac" = rcell(c(0.1, 0.1), format = "xx (xx)")
    )
  }) %>%
  build_table(tern_ex_adsl) %>%
  prune_table()
tree_row_elem <- collect_leaves(tbl[2, ])[[1]]
result <- max(h_row_first_values(tree_row_elem))
result

# Row counts (integer values)
# h_row_counts(tree_row_elem) # Fails because there are no integers
# Using values with integers
tree_row_elem <- collect_leaves(tbl[3, ])[[1]]
result <- h_row_counts(tree_row_elem)
# result

# Row fractions
tree_row_elem <- collect_leaves(tbl[4, ])[[1]]
h_row_fractions(tree_row_elem)