Label, Unit | R Documentation |
Set and retrieve the label
, resp. unit
attribute of x
. This can be helpful for documenting the specific meaning of a variable, of an entire data.frame or any other object. For single vectors it can be useful to store the unit.
Label(x)
Label(x) <- value
Labels(x)
Labels(x) <- value
Unit(x)
Unit(x) <- value
x |
any object |
value |
a single string describing the object |
The label should consist of a single text (length of 1). The text may contain line feeds.
It can be deleted by setting the label to NULL
.
Labels()
can be used to retrieve and assign vectorized labels to data.frames or lists.
Label
and Unit
return the label attribute of x, if any; otherwise, NULL.
Andri Signorell <andri@signorell.net>
A more elaborated label version can be found in package Hmisc label()
.
# add a descriptive label to a variable
Label(d.diamonds$colour) <- "The rating scale applied to diamonds ranges from colorless
to yellow, as any other color is extremely rare."
# technically just appending the text as attribute to the variable
attributes(d.diamonds$colour)
# label is supported while describing data
Desc(d.diamonds$colour)
# The label can be deleted by setting it to NULL
Label(d.diamonds$colour) <- NULL
# Labelling the columns of a data.frame is best done with a loop
# (all so far seen *apply aproaches lead to more complicated code...)
lbl <- RndWord(16, 7)
for(i in seq_along(lbl))
Label(d.pizza[, i]) <- lbl[i]
Str(d.pizza)
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