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ENVIRONMENT
\function = function to plot.
\xmin     = minimum x value
\xmax     = maximum x value
\xinc     = increment in x values
     
EXAMPLE
\function = "cos(x)"
\xmin     = "0"
\xmax     = "2 * 3.14"
\xinc     = "0.1"
create columns from function
draw curve
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NOTE: This only works on machines which have the `<font color="#82140F"><code>awk</code></font>' command
available at th