Draw a Bubble Plot

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Description

Draw a bubble plot, defined by a pair of coordinates x, y to place the bubbles, an area definition configuring the dimension and a color vector setting the color of the bubbles. The legitimation to define a new function instead of just using plot(symbols(...)) is the automated calculation of the axis limits, ensuring that all bubbles will be fully visible.

Usage

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PlotBubble(x, ...)

## Default S3 method:
PlotBubble(x, y, area, col, border = NA, na.rm = FALSE, inches = FALSE, ...)

## S3 method for class 'formula'
PlotBubble(formula, data = parent.frame(), ..., subset, ylab = varnames[response])

Arguments

x, y

the x and y co-ordinates for the centres of the bubbles. They can be specified in any way which is accepted by xy.coords.

area

a vector giving the area of the bubbles.

col

colors for the bubbles, passed to symbol.

border

the border color fot the bubbles. Set NA if there should be no border at all. This is the default.

na.rm

logical, should NAs be omitted? Defaults to FALSE.

inches

TRUE, FALSE or a positive number. See 'Details'.

formula

a formula of the form lhs ~ rhs where lhs gives the data values and rhs the corresponding groups.

data

an optional matrix or data frame (or similar: see model.frame) containing the variables in the formula formula. By default the variables are taken from environment(formula).

subset

an optional vector specifying a subset of observations to be used.

ylab

the y-label for the plot used in the formula interface.

...

the dots are passed to the plot function.

Details

Argument inches controls the sizes of the symbols. If TRUE (the default), the symbols are scaled so that the largest dimension of any symbol is one inch. If a positive number is given the symbols are scaled to make largest dimension this size in inches (so TRUE and 1 are equivalent). If inches is FALSE, the units are taken to be those of the appropriate axes. This behaviour is the same as in symbols.

Note

A legend can be added with BubbleLegend.

Author(s)

Andri Signorell <andri@signorell.net>

See Also

BubbleLegend, symbols, sunflowerplot

Examples

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PlotBubble(x=d.pizza$delivery_min, y=d.pizza$temperature, area=d.pizza$price/40,
           xlab="delivery time", ylab="temperature",
           col=SetAlpha(as.numeric(d.pizza$area)+2, .5), border="darkgrey",
           na.rm=TRUE, main="Price-Bubbles", panel.first=grid())

BubbleLegend("bottomleft", frame=TRUE, cols=SetAlpha("steelblue",0.5), bg="green",
             radius = c(10, 5, 2)/2, labels=c(10, 5, 2), cex=0.8,
             cols.lbl=c("yellow", "red","blue"), width=12)

PlotBubble(latitude ~ longitude, area=(smoky+1)*2e8,
           col=SetAlpha(1, 0.5), data=d.whisky)

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