Panel Function for Histograms

USAGE:

panel.histogram(x, y, ...) 

ARGUMENTS:

x
horizontal coordinates of bar centers.
y
vertical coordinates giving bar heights.
...
graphical parameters can be given to control the characteristics of the lines of the histogram. By default, parameter col is given by the trellis parameters histogram.fill.

SIDE EFFECTS:

A histogram is drawn based on the x and y values.

SEE ALSO:

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