Access Objects in a Trial Comparison

Extracts a contained comparison object by name or position.

$ accesses named comparison objects while preserving public R6 members.

Usage

# S3 method for class 'TrialComparison'
x[[i, ..., exact = TRUE]]

# S3 method for class 'TrialComparison'
x$name

Arguments

x

A TrialComparison.

i

A single object name or a positive integer position.

...

Further indices are not supported.

exact

Whether character indices must match exactly, as for list [[. $ always matches exactly.

name

An object name, supplied literally after $.

Value

The contained object by reference, or NULL for an unknown name.

Details

Object names are unique. Numeric positions refer to the stored object order. R6 members take precedence for $: x$add is the method even when an object is named "add"; use x[["add"]] to select that object. [[ selects contained objects first and falls back to existing R6 members for other character names. This also preserves existing internal field access. These methods provide extraction; replacing collection entries is not supported. Use getComparison() or $add() to build or extend the collection.

Examples

comparison <- getComparison(fixed = getDesignFixed(),
    sequential = getDesignGroupSequential(kMax = 2))
identical(comparison$fixed, comparison[["fixed"]])
#> [1] TRUE
identical(comparison[[1]], comparison$fixed)
#> [1] TRUE