MALDIquant (version 0.2)

labelPeaks-methods: Draws peak labels to plot.

Description

labelPeaks draws the corresponding mass values on top of the peaks stored in a SinglePeakList object to a plot.

Usage

## S3 method for class 'SinglePeakList':
labelPeaks(x,
    number=10, decreasing=TRUE, xlim=c(min(x@mass),
    max(x@mass)), underline=TRUE, upsideDown=FALSE,
    verticalOffset=ceiling(max(x@intensity)/20), col="black", cex=0.7,
    adj=c(0.5, 0),
    ...)

Arguments

x

SinglePeakList object

number

number of peaks to label

decreasing

control sorting; if decreasing == TRUE (decreasing == FALSE) label the number most (less) accumulated intensity

xlim

only label intensity between xlim[1] and xlim[2]

underline

underline peak values?

upsideDown

if upsideDown == TRUE invert peak values

verticalOffset

move label vertically

col

text colour, see par

cex

font size, see par

adj

adjust text to the left, center, right and top, center, bottom; see text

...

arguments to be passed to text

See Also

SinglePeakList, plot,AbstractSpectrumData,missing-method

Examples

## load library
library("MALDIquant");

## create a SinglePeakList object from scratch
spl <- new("SinglePeakList", mass=1:5, intensity=sample(x=100:10000, size=5),
metaData=list(name="unrealistic example"));

## plot peaks
plot(spl);

## label peaks
labelPeaks(spl);