dunlin (version 0.1.9)

reformat: Reformat Values

Description

Reformat Values

Usage

reformat(obj, ...)
# S3 method for default
reformat(obj, format, ...)
# S3 method for character
reformat(obj, format, ..., verbose = FALSE)
# S3 method for factor
reformat(obj, format, ..., verbose = FALSE)
# S3 method for list
reformat(
  obj,
  format,
  ...,
  verbose = get_arg("dunlin.reformat.verbose", "R_DUNLIN_REFORMAT_VERBOSE", FALSE)
)

Value

(character, factor or list of data.frame) with remapped values.

Arguments

obj

(character, factor or list of data.frame) to reformat.

...

for compatibility between methods and pass additional special mapping to transform rules.

• .string_as_fct (flag) whether the reformatted character object should be converted to factor.

• .to_NA (character) values that should be converted to NA. For factor, the corresponding levels are dropped. If NULL, the argument will be taken from the to_NAattribute of the rule.

• .drop (flag) whether to drop empty levels. If NULL, the argument will be taken from the dropattribute of the rule.

• .na_last (flag) whether the level replacing NA should be last.

format

(rule) or (list) of rule depending on the class of obj.

verbose

(flag) whether to print the format.

Examples

# Reformatting of character.
obj <- c("a", "b", "x", NA, "")
attr(obj, "label") <- "my label"
format <- rule("A" = "a", "NN" = NA)

reformat(obj, format)
reformat(obj, format, .string_as_fct = FALSE, .to_NA = NULL)

# Reformatting of factor.
obj <- factor(c("first", "a", "aa", "b", "x", NA), levels = c("first", "x", "b", "aa", "a", "z"))
attr(obj, "label") <- "my label"
format <- rule("A" = c("a", "aa"), "NN" = c(NA, "x"), "Not_present" = "z", "Not_a_level" = "P")

reformat(obj, format)
reformat(obj, format, .na_last = FALSE, .to_NA = "b", .drop = FALSE)

# Reformatting of list of data.frame.
df1 <- data.frame(
  var1 = c("a", "b", NA),
  var2 = factor(c("F1", "F2", NA))
)

df2 <- data.frame(
  var1 = c("x", NA, "y"),
  var2 = factor(c("F11", NA, "F22"))
)

db <- list(df1 = df1, df2 = df2)

format <- list(
  df1 = list(
    var1 = rule("X" = "x", "N" = NA, .to_NA = "b")
  ),
  df2 = list(
    var2 = rule("f11" = "F11", "NN" = NA)
  ),
  all_datasets = list(
    var1 = rule("xx" = "x", "aa" = "a")
  )
)

reformat(db, format)