qbars
Bar plot with bar width specified in data coordinates
Help text:
qbars(xx, yy, w) draws a bar graph of yy vs xx with bars
of width w specified in data coordinates.
qbars(xx, yy, w, y0) specifies the baseline of the plot;
default for y0 is 0. y0 may also be a vector (which must
then be the same size as xx and yy). This is useful for
creating stacked bar graphs.
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