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Visualizing plots

In this example, we create a single trace full of noise and then send it to sfgraph to produce a single VPLOT file, file.vpl. As you may have noticed, this only creates the file which is useful for saving the plot, does not allow us to visualize the data. To visualize the data we need to use a pen, which tells your machine how to actually draw the plot. A typical Madagascar installation will have multiple pens available for you to use. By default, you should use sfpen which will pick the best pen available for you. You can use sfpen to visualize your plots in the following manner:

sfpen < file.vpl

This will pop up a screen on your window with the plot shown. Depending on which pen you are using you may be able to interact with the pen interface to control various parameters of the plot as shown by the buttons at the top of the screen. Depending on the pen that you are using, there may be keyboard shortcuts to many of the buttons. NOTE: oglpen uses a mouse interface that can be accessed by right-clicking on the plot.

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