File: bailey.jgr

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(* Example of Unix spline(1) to smooth a curve.
This is a file to draw sin(i) for i going from -pi to pi *)

newgraph

yaxis min -1 max 1 label : sin(i)
xaxis label : i
grid_lines
border
title : Example Unix spline(1) to interpolate points

(* Plot the sin curve *)
newline
  label : data
  pts include bailey.pts
copycurve
  label : splined
  linetype dotted
  pts shell : spline < bailey.pts

(* 
bailey.pts file:
-3.1416 0.0
-1.81 -0.9715
-0.55 -0.5226
 0.71  0.6518
 1.97  0.9213
 3.1416 0.0
*)