8 パラメーター曲面を描く

(準備中)

$(x/a)^2+(y/b)^2+(z/c)^2=1$

# parametric-4.gp --- 
set parametric
a=4;b=3;c=2
set urange [0:pi]
set vrange [0:2*pi]
splot a*sin(u)*cos(v),b*sin(u)*sin(v),c*cos(u)
pause -1 "Hit Enter key!"
set term postscript eps color
set output "parametric-4.eps"
replot

図 17: $(x/a)^2+(y/b)^2+(z/c)^2=1$

$x^2+y^2-z^2=1$

# parametric-5.gp --- 
set parametric
set urange [0:2]
set vrange [0:2*pi]
splot sinh(u)*cos(v),sinh(u)*sin(v),cosh(u),\
      sinh(u)*cos(v),sinh(u)*sin(v),-cosh(u)
pause -1 "Hit Enter key!"
set term postscript eps color
set output "parametric-5.eps"
replot

図 18: $x^2+y^2-z^2=1$