Plotting from an analytic function expression

Plot in cartesian coordinate system



In [1]:

    
require 'gnuplotrb'
include GnuplotRB

cartesian = Plot.new(
  ['x*sin(x)', with: 'lines', lt: { rgb: 'blue', lw: 3 }],
  xrange: -10..10,
  title: 'Math function example', 
  ylabel: 'x',
  xlabel: 'x*sin(x)'
)









    Out[1]:

Plot in polar coordinate system



In [2]:

    
Plot.new(
  ['abs(sin(3*t))', with: 'filledcurves', lt: { rgb: 'red' }],
  title: 'Plot in polar example',
  polar: true,
  samples: 500
)









    Out[2]:

Plot from a parametric function expression



In [3]:

    
Plot.new(
  ['1.5*cos(t) - cos(30*t), 1.5*sin(t) - sin(30*t)', title: 'Parametric curve', lw: 2],
  title: 'Parametric plot example',
  parametric: true,
  samples: 1000,
  xrange: -3..3,
  yrange: -3..3
)









    Out[3]: