This is barplot for tis objects. If the first argument
to barplot is a tis object, this function is called.
There may be more than one tis argument. See details below.
# S3 method for tis
barplot(height, …)a tis object. There may, however, be more than
just one tis argument in the call.
arguments passed on to barplot.default.
same as barplot.default.
barplot.tis constructs a call to barplot2.
The tis arguments, including but not limited to height,
are pulled out and used to construct a height argument for the
constructed call, and the width argument will be calculated as
described below.
If the series sent in are multivariate, i.e., have multiple columns,
the constructed height argument will also have multiple
columns, which is how barplot does stacked bar charts.
If you supply several multivariate series to
barplot.tis, all of the series must have the same number of columns.
If the beside argument is supplied in the … list, the
width argument will be set to d/(NC + 0.5), where
d is the mean difference in decimal time units (where one year
= 1, a quarter = 0.25, and so on) of the series observation times,
NC is the number of columns in the series arguments, and
space will be set to c(0, 0.5). The effect of
all this will be to make the total width of the barplot match the
length (in years) of the series plotted. When combined with the
calculated x.offset described below, this will make the plot
align correctly on the time axis. However, note that the alignment
will only really be correct if all of the series plotted have the same
frequency, as the underlying barplot.default forces each group
of bars to have the same width when beside = TRUE.
If the series being plotted are of different frequencies, you should
not set beside, leaving it at the default value of
FALSE. This will cause the widths of the bars for each series
to be inversely proportional to the series frequencies, and the
individual observations will align correctly on the time axis.
barplot.tis finds the earliest starting date of the
tis arguments and shifts the plot rightward along the x-axis by
that amount, which aligns the first bar with its start date. That is,
if gdp is the tis argument with the earliest start date of all
the series being plotted, the plot is shifted rightward to make the
first bar align with time(start(gdp)).
You can use tisPlot to draw axes, axis labels, and tick marks
for a barplot. First call tisPlot with the series
you want to plot, and other arguments set to create the range, axes,
labels, tick marks and so on that you want, but set color = 0
to make the series lines invisible. Then call barplot with the
series and additional barplot arguments, but set the add
argument to add = TRUE. This adds the barplot, without axes, to
the existing tisPlot.