truehist {MASS}  R Documentation 
Creates a histogram on the current graphics device.
truehist(data, nbins = "Scott", h, x0 = h/1000, breaks, prob = TRUE, xlim = range(breaks), ymax = max(est), col, xlab = deparse(substitute(data)), bty = "n", ...)
data 
numeric vector of data for histogram. Missing values (NA s)
are allowed and omitted.

nbins 
The suggested number of bins. Either a number, or a character string
naming a rule: "Scott" or "FreedmanDiaconis" or "FD" . (Case is
ignored.)

h 
The bin width (takes precedence over nbins ).

x0 
Shift for the bins  the breaks are at x0 + h * (..., 1, 0, 1, ...)

breaks 
The set of breakpoints to be used. (Usually omitted, takes precedence
over h and nbins ).

prob 
If true (the default) plot a true histogram. The vertical axis has a relative frequency density scale, so the product of the dimensions of any panel gives the relative frequency. Hence the total area under the histogram is 1 and it is directly comparable with most other estimates of the probability density function. If false plot the counts in the bins. 
xlim 
The limits for the xaxis. 
ymax 
The upper limit for the yaxis. 
col 
The colour number for the bar fill. 
xlab 
label for the plot xaxis. By default, this will be the name of data .

bty 
The box type for the plot  defaults to none. 
... 
additional arguments to rect or plot .

This plots a true histogram, a density estimate of total area 1. If
breaks
is specified, those breakpoints are used. Otherwise if
h
is specified, a regular grid of bins is used with width
h
. If neither breaks
nor h
is specified,
nbins
is used to select a suitable h
.
A histogram is plotted on the current device.
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.