# PyX — Examples: Bar graphs

In this section we show you the basic features of bar graphs in PyX. All examples shown here use the same data from `minimal.dat`

available for download at the first minimal bar-graph example.

Note that bar graphs differ from other xy-graphs in that they use *discrete axes* for one graph dimension. However, the only affected components of this fundamental change are one of the axes, which needs to be come a discrete one, i.e. a bar axis, and the usage of appropriate graph styles.

## Overview for this section

### Minimal bar-graph example

For a minimal bar plot you have set an bar axis in the graph constructor and provide Xname column data (X stands for the bar axis to be used). more ...

### Naming bars

To name the bars you just need to use a proper data column (instead of column 0, which is the line number in `data.file`

instances).
more ...

### Changing the attributes of the bars

This example is equal to the minimal bar-graph example except for the used style to draw the bars. more ...

### Comparing bars

To draw bars side by side to show differences for the same value you basically need to replace the bar axis by a nestedbar axis and adjust the data to that nesting. more ...

### Changing the starting values of the bars

To adjust the value the bars are starting at you need to set a `fromvalue`

at the `barpos`

style.
more ...

### Stack bars on top of each other

To stack bars on top of each other, you can add stackedbarpos styles and further bars to the list of styles. more ...

### Skipping the first bar in a stacked bargraph

This example shows a bar graph, which starts with a stacked bar skipping to plot the original bar. more ...