# plot.formula

0th

Percentile

##### Formula Notation for Scatterplots

Specify a scatterplot or add points, lines, or text via a formula.

Keywords
hplot, aplot
##### Usage
# S3 method for formula
plot(formula, data = parent.frame(), …, subset,
ylab = varnames[response], ask = dev.interactive())# S3 method for formula
points(formula, data = parent.frame(), …, subset)# S3 method for formula
lines(formula, data = parent.frame(), …, subset)# S3 method for formula
text(formula, data = parent.frame(), …, subset)
##### Arguments
formula

a formula, such as y ~ x.

data

a data.frame (or list) from which the variables in formula should be taken. A matrix is converted to a data frame.

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).

logical, see par.

##### Details

For the lines, points and text methods the formula should be of the form y ~ x or y ~ 1 with a left-hand side and a single term on the right-hand side. The plot method accepts other forms discussed later in this section.

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. A plot against the running index can be specified as plot(y ~ 1).

If the formula in the plot method contains more than one term on the right-hand side, a series of plots is produced of the response against each non-response term.

For the plot method the formula can be of the form ~ z + y + z: the variables specified on the right-hand side are collected into a data frame, subsetted if specified, and displayed by plot.data.frame.

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 specified (see boxplot).

Note that some arguments will need to be protected from premature evaluation by enclosing them in quote: currently this is done automatically for main, sub and xlab. For example, it is needed for the panel.first and panel.last arguments passed to plot.default.

##### Value

These functions are invoked for their side effect of drawing on the active graphics device.

plot.default, points, lines, plot.factor.

##### Aliases
• plot.formula
• lines.formula
• points.formula
• text.formula
##### Examples
library(graphics) # NOT RUN { 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) ## text.formula() can be very natural: wb <- within(warpbreaks, { time <- seq_along(breaks); W.T <- wool:tension }) plot(breaks ~ time, data = wb, type = "b") text(breaks ~ time, data = wb, label = W.T, col = 1+as.integer(wool)) # } 
Documentation reproduced from package graphics, version 3.5.2, License: Part of R 3.5.2

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