## Script examples gallery - Bar graphs / histograms

Version 2.32
Scripts

Manual page for Script_examples_gallery_-_Bar_graphs_/_histograms(PL)

This page contains a series of vertical bar graph examples illustrating the available varieties and options. These examples all use ploticus's proc bars, which renders bar graphs, error bars, and bar segments, in vertical or horizontal orientation. Clickmaps are supported for bar graphs.

### (See also the examples for bars prefab, chron prefab and dist prefab.)

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Example 1

stock2
A stock price/volume display. The bars show low-high range for the day (segmentfields attribute), and have left tics to show opening price, and right tics to show closing price.

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Example 2

bars2
In this example, values less than zero result in red downward bars. The positive bars are done first using orange and then the negative bars are done using red. The values are displayed near the ends of the bars using the showvalues option.

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Example 3

hitcount
A histogram example, which utilizes datetime scaling as well as some of ploticus's data filtering / processing features.

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Example 4

bars3
Stacked bars. These show magnitude of several components as well as the sum of the components. proc bars is executed four times, first to render bars for Steve, then for Lisa, then for Rob, then for Takisha. The stackfield attribute indicates what data field(s) should be used to raise the bars. For a full-page version of this see vermonth. Note: stacking cannot be used when components are a mixture of positive and negative values.

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Example 5

students
This example allows a variable number of datafields, and the number of bars per cluster (as well as the legend) follows the number of datafields on input.

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Example 6

bars5a
Stacked, clustered bars. These may be useful in displaying multiple variables, groupings, and instances. proc bars is executed once for each color of bar, using the stackfield and cluster attributes to control position. bars5 is another example of stack clustered bars.

### Example 7

snpmap1
This example used proc scatterplot to generate the bars rather than proc bars. Proc scatterplot can cluster points to string them upward to form little bars. This is a convenient way to show multi-tiered frequency distributions. The multiple colors are achieved by overlaying several subgroups of data of diminishing size.

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Example 8

propbars2
Here, the bar segments represent proportions of a whole. The stackfields attribute is used to position bars. See also propbars1, a horizontal example of proportional bars.

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Examples of bar labeling

bars6
Here, bar labels are formatted using the labelword attribute to show dollar amounts.
bars7
Longwise labels, formatted to show dollar amounts.
bars8
Individual components of a stacked bar graph labeled with values. Label position is adjusted downward so that label is within bar, and a lighter-colored backing box is used so that the labels are visible.
data display engine
Copyright Steve Grubb

Markup created by unroff 1.0, `` `` August 23, 2005.