| plot.formula {graphics} | R Documentation |
Specify a scatterplot or add points or lines via a formula.
## S3 method for class 'formula':
plot(formula, data = parent.frame(), ..., subset,
ylab = varnames[response], ask = TRUE)
## S3 method for class 'formula':
points(formula, data = parent.frame(), ..., subset)
## S3 method for class 'formula':
lines(formula, data = parent.frame(), ..., subset)
formula |
a formula, such as y ~ x. |
data |
a data.frame (or list) from which the variables in
formula should be taken. |
... |
Arguments to be passed to or from other methods.
horizontal = TRUE is also accepted. |
subset |
an optional vector specifying a subset of observations to be used in the fitting process. |
ylab |
the y label of the plot(s). |
ask |
logical, see par. |
Both the terms in the formula and the ... arguments are
evaluated in data enclosed in parent.frame() if
data is a list or a data frame. The terms of the formula and
those arguments in ... that are of the same length as
data are subjected to the subsetting specified in
subset. If the formula in plot.formula contains more
than one non-response term, a series of plots of y against each term
is given. A plot against the running index can be specified as
plot(y ~ 1).
Missing values are not considered in these methods, and in particular cases with missing values are not removed.
If y is an object (i.e. has a class attribute)
then plot.formula looks for a plot method for that class first.
Otherwise, the class of x will determine the type of the plot.
For factors this will be a parallel boxplot, and argument
horizontal = TRUE can be used (see boxplot).
These functions are invoked for their side effect of drawing in the active graphics device.
plot.default, points, lines,
plot.factor.
op <- par(mfrow=c(2,1))
plot(Ozone ~ Wind, data = airquality, pch=as.character(Month))
plot(Ozone ~ Wind, data = airquality, pch=as.character(Month),
subset = Month != 7)
par(op)