Transform Range

Transforms results from the source range to the target range. For example, for transforming source values 1, 2, 3, 4, 5 to 0, 25, 50, 75, 100.

Usage

transform_range(
  source,
  source_range,
  target_range,
  flip_direction = FALSE,
  outside_range = "NA"
)

Arguments

source

A vector of values to be transformed

A numeric vector is expected.

source_range

The permitted source range

A numeric vector containing two elements is expected, representing the lower and upper bounds of the permitted source range.

target_range

The target range

A numeric vector containing two elements is expected, representing the lower and upper bounds of the target range.

flip_direction

Flip direction of the range?

The transformed values will be reversed within the target range, e.g. within the range 0 to 100, 25 would be reversed to 75.

Permitted Values: TRUE, FALSE

outside_range

Handling of values outside the source range

Values outside the source range (source_range) are transformed to NA.

If "warning" or "error" is specified, a warning or error is issued if source includes any values outside the source range.

Permitted Values: "NA", "warning", "error"

Value

The source linearly transformed to the target range

Details

Returns the values of source linearly transformed from the source range (source_range) to the target range (target_range). Values outside the source range are set to NA.

See also

BDS-Findings Functions that returns a vector: compute_bmi(), compute_bsa(), compute_egfr(), compute_framingham(), compute_map(), compute_qtc(), compute_qual_imputation(), compute_qual_imputation_dec(), compute_rr(), compute_scale()

Examples

transform_range(
  source = c(1, 4, 3, 6, 5),
  source_range = c(1, 5),
  target_range = c(0, 100)
)
#> [1]   0  75  50  NA 100

transform_range(
  source = c(1, 4, 3, 6, 5),
  source_range = c(1, 5),
  target_range = c(0, 100),
  flip_direction = TRUE
)
#> [1] 100  25  50  NA   0