stabilize_dbl: Ensure a double argument meets expectations

In stbl: Stabilize Function Arguments

Ensure a double argument meets expectations

Description

to_dbl() checks whether an argument can be coerced to double without losing information, returning it silently if so. Otherwise an informative error message is signaled.

stabilize_dbl() can check more details about the argument, but is slower than to_dbl().

stabilize_dbl_scalar() and to_dbl_scalar() are optimized to check for length-1 double vectors.

Usage

stabilize_dbl(
  x,
  ...,
  allow_null = TRUE,
  allow_na = TRUE,
  coerce_character = TRUE,
  coerce_factor = TRUE,
  min_size = NULL,
  max_size = NULL,
  min_value = NULL,
  max_value = NULL,
  x_arg = caller_arg(x),
  call = caller_env(),
  x_class = object_type(x)
)

stabilize_dbl_scalar(
  x,
  ...,
  allow_null = TRUE,
  allow_zero_length = TRUE,
  allow_na = TRUE,
  coerce_character = TRUE,
  coerce_factor = TRUE,
  min_value = NULL,
  max_value = NULL,
  x_arg = caller_arg(x),
  call = caller_env(),
  x_class = object_type(x)
)

to_dbl(
  x,
  ...,
  x_arg = caller_arg(x),
  call = caller_env(),
  x_class = object_type(x)
)

## S3 method for class ''NULL''
to_dbl(x, ..., allow_null = TRUE, x_arg = caller_arg(x), call = caller_env())

## S3 method for class 'character'
to_dbl(
  x,
  ...,
  coerce_character = TRUE,
  x_arg = caller_arg(x),
  call = caller_env(),
  x_class = object_type(x)
)

## S3 method for class 'factor'
to_dbl(
  x,
  ...,
  coerce_factor = TRUE,
  x_arg = caller_arg(x),
  call = caller_env(),
  x_class = object_type(x)
)

to_dbl_scalar(
  x,
  ...,
  allow_null = TRUE,
  allow_zero_length = TRUE,
  x_arg = caller_arg(x),
  call = caller_env(),
  x_class = object_type(x)
)

Arguments

x	The argument to stabilize.
...	Arguments passed to methods.
allow_null	⁠(length-1 logical)⁠ Is NULL an acceptable value?
allow_na	⁠(length-1 logical)⁠ Are NA values ok?
coerce_character	⁠(length-1 logical)⁠ Should character vectors such as "1" and "2.0" be considered numeric-ish?
coerce_factor	⁠(length-1 logical)⁠ Should factors with values such as "1" and "2.0" be considered numeric-ish? Note that this package uses the character value from the factor, while as.integer() and as.double() use the integer index of the factor.
min_size	⁠(length-1 integer)⁠ The minimum size of the object. Object size will be tested using vctrs::vec_size().
max_size	⁠(length-1 integer)⁠ The maximum size of the object. Object size will be tested using vctrs::vec_size().
min_value	⁠(length-1 numeric)⁠ The lowest allowed value for x. If NULL (default) values are not checked.
max_value	⁠(length-1 numeric)⁠ The highest allowed value for x. If NULL (default) values are not checked.
x_arg	⁠(length-1 character)⁠ An argument name for x. The automatic value will work in most cases, or pass it through from higher-level functions to make error messages clearer in unexported functions.
call	(environment) The execution environment to mention as the source of error messages.
x_class	⁠(length-1 character)⁠ The class name of x to use in error messages. Use this if you remove a special class from x before checking its coercion, but want the error message to match the original class.
allow_zero_length	⁠(length-1 logical)⁠ Are zero-length vectors acceptable?

Value

The argument as a double.

Examples

to_dbl(1:10)
to_dbl("1.1")
to_dbl(1 + 0i)
to_dbl(NULL)
try(to_dbl("a"))
try(to_dbl("1.1", coerce_character = FALSE))

to_dbl_scalar("1.1")
try(to_dbl_scalar(1:10))

stabilize_dbl(1:10)
stabilize_dbl("1.1")
stabilize_dbl(1 + 0i)
stabilize_dbl(NULL)
try(stabilize_dbl(NULL, allow_null = FALSE))
try(stabilize_dbl(c(1.1, NA), allow_na = FALSE))
try(stabilize_dbl(letters))
try(stabilize_dbl("1.1", coerce_character = FALSE))
try(stabilize_dbl(factor(c("1.1", "a"))))
try(stabilize_dbl(factor("1.1"), coerce_factor = FALSE))
try(stabilize_dbl(1:10, min_value = 3.5))
try(stabilize_dbl(1:10, max_value = 7.5))

stabilize_dbl_scalar(1.0)
stabilize_dbl_scalar("1.1")
try(stabilize_dbl_scalar(1:10))
stabilize_dbl_scalar(NULL)
try(stabilize_dbl_scalar(NULL, allow_null = FALSE))

stbl documentation built on Nov. 5, 2025, 6:02 p.m.