# Author: Ika # Date: 12/11/2014  set term svg font 'Times, 18' size 500,300 set output 'parabola_circle.svg'  # In this program, the parabola equation is y = x^2. # The circle equation is x^2 + (y-0.5)^2 = 1/4. # We make it parametric as x = sin(t), y = 0.5 + cos(t).  set multiplot  # The ratio of the height and width of the plot chart is 1/2 = 0.5. set size ratio 0.5 set xrange [-1:1] set yrange [0:1] # Unit along the axes is 0.5. set xtics 0.5 set ytics 0.5 # Draw the axes. set xzeroaxis lt -1 lc rgb "black" lw 1 set yzeroaxis lt -1 lc rgb "black" lw 1 set grid  unset label set key off  # Draw the parabola y=x^2. plot x*x lc rgb "black" lw 2; # Draw the circle by using the parametric equations. set parametric                               set trange [0:2*pi] plot 0.5*sin(t), 0.5+0.5*cos(t) lc rgb "red" lw 3; 	 unset multiplot  set term x11 set output