pcaPlot: Plot the first two principle components
In pimentel/haRold: Harold Pimentel's basic functions

Description Usage Arguments Value Examples

Given a data.frame, plot the first two principle components and label them

1 2	pcaPlot(df, groups = NULL, useColLabels = TRUE, centerDf = TRUE, scaleDf = FALSE)

`df`	a data.frame with columns referring to different experimental conditions
`groups`	group by which to color columns by
`useColLabels`	if true, print the column names on the plot
`centerDf`	center df in prcomp
`scaleDf`	scale df in prcomp

a ggplot object

require(graphics)

head(USArrests)
pcaPlot(USArrests)
pcaPlot(USArrests[,c('Murder', 'Assault', 'Rape')])
pcaPlot(USArrests, c('crime', 'crime', 'pop', 'crime'))
pcaPlot(USArrests, c('crime', 'crime', 'pop', 'crime'), F)