Plotting on subintervals
gnuplot has built-in a respectable collection of special functions and mathematical operators that allow us to perform significant calculations and massaging of data before plotting. A complete survey of gnuplot's math brain is beyond the scope of this book; interested readers should start with Chapter 13 of the official reference manual distributed with the program and available at http://gnuplot.info/documentation.html.
Here, we shall merely give an example of one very useful technique for plotting functions that have different definitions over different domains; this technique works equally well for functions that are continuous or discontinuous over the entire plotting domain. The example will demonstrate several of ...
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