label(x) retrieves the
label attribute of
x.
label(x) <- "a label"
stores the label attribute, and also puts
the class
labelled as the first class of
x (for S-Plus 5
and later this class is not used and methods for handling this class are
not defined so the
"label" and
"units" attributes are lost
upon subsetting). The reason for having this class is so that the
subscripting method for
labelled,
[.labelled, can preserve
the
label attribute in R and S-Plus 2000. Also, the
print
method for
labelled objects prefaces the print with the object's
label
(and
units if there). If the variable is also given
a
"units" attribute using the
units function, subsetting
the variable (using
[.labelled) will also retain the
"units"
attribute.
label can optionally append a
"units" attribute to the
string, and it can optionally return a string or expression (for R's
plotmath
facility) suitable for plotting.
labelPlotmath
is a function that also has this function, when the input arguments are
the
'label' and
'units' rather than a vector having those
attributes. When
plotmath mode is used to construct labels, the
'label'
or
'units' may contain math expressions but they
are typed verbatim if they contain percent signs, blanks, or underscores.
Label (actually
Label.data.frame) is a function which generates
S-Plus source code that makes the labels in all the variables in a data
frame easy to edit.
llist is like
list except that it preserves the names or
labels of the component variables in the variables
label
attribute. This can be useful when looping over variables or using
sapply
or
lapply. By using
llist instead of
list
one can annotate the output with the current variable's name
or label.
llist also defines a
names attribute for the
list and pulls the
names from the arguments' expressions for
non-named arguments.
plotmathTranslate is a simple function that translates certain
character strings to character strings that can be used as part of R
plotmath
expressions. If the input string has a space or percent
inside, the string is surrounded by a call to
plotmath's
paste
function.
as.data.frame.labelled is a utility function that is called by
[.data.frame
. It is just a copy of
as.data.frame.vector.
data.frame.labelled
is another utility function, that adds a
class
"labelled" to every variable in a data frame that has a
"label"
attribute but not a
"labelled" class.
reLabelled is used to add a
'labelled' class back to
variables in data frame that have a 'label' attribute but no 'labelled'
oldClass. Useful for changing
cleanup.import()'d S-Plus 6 data
frames back to general form for R and S-Plus 2000.
label(x, units=FALSE, plot=FALSE, default=NULL, grid=FALSE) label(x) <- value labelPlotmath(label, units=NULL, plotmath=.R., grid=FALSE) ## S3 method for class 'labelled': print(x, ...) ## or x - calls print.labelled Label(object, ...) ## S3 method for class 'data.frame': Label(object, file='', append=FALSE, ...) llist(..., labels=TRUE) plotmathTranslate(x) data.frame.labelled(object) reLabelled(object)
plotmathTranslate is a character string)
TRUE to append the
'units' attribute (if present)
to the returned label. The
'units' are surrounded
by brackets. For
labelPlotmath is a character string
containing the units of measurement.
TRUE to return a label suitable for R's
plotmath
facility (returns an expression instead of a character string) if R is
in effect. If
units is also
TRUE, and if both
'label' and
'units' attributes are present, the
'units' will appear after the label but in smaller type and
will not be surrounded by brackets.
x does not have a
'label' attribute and
default (a character string) is specified, the label will be
taken as
default
lattice and
grid functions do not support
plotmath expressions for
xlab and
ylab
arguments. When using
lattice functions in R, set the
argument
grid to
TRUE so that
labelPlotmath can
return an ordinary character string instead of an expression.
TRUE to have
labelMathplot return an expression
for plotting using R's
plotmath facility. If R is not in
effect, an ordinary character string is returned.
list.
Ignored for
print.labelled.
"", meaning standard output.
TRUE to append code generated by
Label to file
file
FALSE to make
llist ignore the variables'
label attribute and
use the variables' names.
label returns the label attribute of x, if any; otherwise, "".
label
is used
most often for the individual variables in data frames. The function
sas.get
copies labels over from SAS if they exist.
age <- c(21,65,43)
y <- 1:3
label(age) <- "Age in Years"
plot(age, y, xlab=label(age))
x1 <- 1:10
x2 <- 10:1
label(x2) <- 'Label for x2'
units(x2) <- 'mmHg'
x2
x2[1:5]
dframe <- data.frame(x1, x2)
Label(dframe)
##In these examples of llist, note that labels are printed after
##variable names, because of print.labelled
a <- 1:3
b <- 4:6
label(b) <- 'B Label'
llist(a,b)
llist(a,b,d=0)
llist(a,b,0)
w <- llist(a, b>5, d=101:103)
sapply(w, function(x){
hist(as.numeric(x), xlab=label(x))
# locator(1) ## wait for mouse click
})
# Or: for(u in w) {hist(u); title(label(u))}