我基本上想画2d色面(或等高线图) rosenbrock函数f(x,y)=(a-x)^ 2 + b *(y-x * x)^ 2 并在此图像上附加一些点(x,y)。
带点的示例文件如下所示:
#x #y
15.00000 12.00000
8.00000 9.00000
问题是,两个图形在输出图像上不共享相同的坐标系:
coordinate systems do not overlap on each other
gnuplot代码:
#!/usr/bin/env gnuplot
reset
set terminal png size 700,700
enhanced set output 'output.png'
set tmargin screen 1
set bmargin screen 0
set border 0 back
set size square
xr=20
yr=20
set xrange [-xr:xr]
set yrange [-yr:yr]
unset key #disablegraph name
unset colorbox
set surface
set multiplot
set view map
set cntrparam levels 10# contour tenderness
set style data pm3d
set pm3d
set contour
a=1 #rosenbrock parameter
b=1 #rosenbrock parameter
#set isosamples 50
splot (a-x) * (a-x) + b * (y-x*x) * (y-x*x) # 2d rosenbrock
unset view
unset pm3d
plot 'data.dat' pt 5, 'data.dat' using 1:2:($0+1) with labels offset 1 notitle
答案 0 :(得分:0)
set size square
xr=20
yr=20
set xrange [-xr:xr]
set yrange [-yr:yr]
unset key
unset colorbox
set surface
set pm3d map
set contour
set cntrparam levels 10# contour tenderness
rosenbrock(x,y,a,b)= (a-x) * (a-x) + b * (y-x*x) * (y-x*x)
splot rosenbrock(x,y,1,1) w pm3d, 'data.dat' u 1:2:0 w p pt 5, 'data.dat' using 1:2:(1):($0+1) with labels offset 1,1 notitle