The is.format function can be used to determine if an object is a
user-defined format of class "fmt".
is.format(x)A logical value or TRUE or FALSE.
The is.format function returns TRUE if the object passed is a
user-defined format. User-defined formats are defined using the value
function. See the value
function help for further details.
value to define a format,
condition to define the conditions for a format, and
fapply to apply the format to a vector.
Other fmt:
as.data.frame.fmt(),
as.fmt(),
as.fmt.data.frame(),
condition(),
labels.fmt(),
print.fmt(),
value()
# Define format
fmt1 <- value(condition(x == "A", "Label A"),
condition(x == "B", "Label B"),
condition(TRUE, "Other"))
#> # A user-defined format: 3 conditions
#> Name Type Expression Label Order
#> 1 x U x == "A" Label A NA
#> 2 x U x == "B" Label B NA
#> 3 x U TRUE Other NA
# Check for format
is.format(fmt1)
#> [1] TRUE
# [1] TRUE
is.format("A")
#> [1] FALSE
# [1] FALSE