Plotting circles
This recipe will introduce gnuplot's ability to place objects at locations specified in a datafile or by mathematical functions, and to define their properties dynamically to convey information about the data. The following figure shows how gnuplot plots circles:
Getting ready
We have provided a datafile called parabolaCircles.text, which is similar to the parabola.text file that we created previously with gnuplot's help, but with a third column that consists of some random numbers. Make sure this file is in your current directory so that gnuplot can find it. Alternatively, use any datafile you like with three columns.
How to do it… ...
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