Plot parametric functions

Plot `y = sin(x)` for `-10 < x < 10` with the axes reversed, i.e., `y` as the horizontal axis and `x` as the vertical axis.

     generate x -10,,10 100
     set xlabel 'sin(x)'
     set ylabel 'x'
     graph sin(x) x

Plot `(x(t),y(t))` for `0 < t < 20`, where `x(t) = exp(-0.1*t)*cos(t)` and `y(t) = exp(-0.1*t)*sin(t)`.

     generate t 0,,20 100
     set xlabel 'e<^>-0.1*t<_>cos(t)'
     set ylabel 'e<^>-0.1*t<_>sin(t)'
     graph exp(-0.1*t)*cos(t) exp(-0.1*t)*sin(t)

Display array data as contours and density plot
Write data to a file