plotrix (version 3.8-2)

plotH: Scatterplot with histogram-like bars.

Description

Scatterplot with histogram-like bars; a modification of plot(...,type="h").

Usage

plotH(x,...)
 # S3 method for formula
plotH(x,data=NULL,xlab=names(mf)[2],ylab=names(mf)[1],...)
 # S3 method for default
plotH(x,y,xlab=paste(deparse(substitute(x))),
  ylab=paste(deparse(substitute(y))),width=0.6,ylim=NULL,col="gray",...)

Value

None, but a plot is produced.

Arguments

x

Vector of x-coordinates or a formula of the form y~x (see below for y).

y

Vector of y-coordinates.

xlab

A string for labeling the x-axis.

ylab

A string for labeling the y-axis.

data

The data frame from which the formula should be evaluated.

width

A numeric that indicates the width of the bars.

ylim

A vector of length two that indicates the limits over which to plot the y-axis. See details.

col

A string that indicates the fill color for the bars.

...

Additional arguments sent to the plot or barplot functions.

Author

Derek Ogle

Details

plotH is meant to be a modification of the type="h" version of plot such that the "bars" appears as actual rectangles rather than vertical lines. It defaults so that the lower bound of the y-axis is 0; change to ylim=NULL to over-ride this default (and return to the default used in plot.

A pass-through to barplot is used if the x (or "RHS") variable is categorical.

See Also

plot, barplot

Examples

  d<-data.frame(x=c(1,5,10:20),y=runif(13)+1,
                yn1=runif(13)-0.5,yn2=runif(13)-2,
                g=factor(sample(c("A","B","C"),13,replace=TRUE)))
  # new plotH function with formula notation
  plotH(y~x,data=d)
  # old plot() function with formula notation -- for comparison's purpose
  plot(y~x,data=d,type="h")
  # new function over-riding default ylim, increasing bar width,
  # and changing bar color
  plotH(y~x,data=d,ylim=range(d$y),width=0.9,col="red")
  # handling some negative values
  plotH(yn1~x,data=d) # not so good, because of default ylim
  plotH(yn1~x,data=d,ylim=c(0,max(d$yn1)))  # old look
  # handling all negative values
  plotH(yn2~x,data=d)
  plotH(yn2~x,data=d,ylim=range(d$yn2))  # old look
  # example of pass-through to barplot
  smry<-by(d$y,d$g,mean)
  plotH(levels(d$g),smry,ylab="Mean of Random Variable",xlab="Group")
  # example of non-formula usage
  x1 <- d$x
  y1 <- d$y
  plotH(x1,y1,col="blue")