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))}