8.2.4 Barcharts and histogramsThe following plot styles allow barcharts to be produced: These styles differ in where the horizontal interfaces between the bars are placed along the abscissa axis and how wide the bars are. In the boxes plot style, the interfaces between the bars are at the midpoints between the specified data points by default (see, for example, Figure 8.1a). Alternatively, the widths of the bars may be set using the set boxwidth command. In this case, all of the bars will be centered on their specified ![]() Figure 8.1: A gallery of the various bar chart styles which Pyxplot can produce. See the text for more details. Having set a fixed box width, the default behaviour of scaling box widths automatically may be restored either with the unset boxwidth command, or by setting the boxwidth to a negative width. In the wboxes plot style, the width of each bar is specified manually as an additional column of the input data file. This plot style expects three columns of data to be provided: the Finally, in the impulses plot style, the bars all have zero width; see Figure 8.2(c) for an example. In all of these plot styles, the bars originate from the line set boxfrom 5 In this case, all of the bars would now originate from the line ![]() Figure 8.2: A second gallery of the various bar chart styles which Pyxplot can produce. See the text for more details. The script and data file used to produce this image are available on the Pyxplot website at http://www.pyxplot.org.uk/examples/Manual/03barchart1/. The bars may be filled using the with fillcolor modifier, followed by the name of a color: plot 'data.dat' with boxes fillcolor blue plot 'data.dat' with boxes fc 4 Figures 8.1(b) and (d) demonstrate the use of filled bars. The boxes and wboxes plot styles expect identically-formatted data when used on two- and three-dimensional plots; in the latter case, all bars are drawn in the plane Stacked bar chartsIf multiple data points are supplied to the boxes or wboxes plot styles at a common 1 1 2 2 2 3 3 4 The second bar at
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