#
# Use of "set nonlinear" to produce a log-scale z axis and contours.
#
set border 15 front lt black
set key at screen 1, 0.9 right top vertical Right
set style textbox opaque margins  0.5,  0.5 noborder
set view 22, 341, 1, 1.1
set isosamples 60, 60
unset surface 
set contour base
set cntrlabel  format '%8.3g' font ',7' start 2 interval 20
set hidden3d back offset 1 trianglepattern 3 undefined 1 altdiagonal bentover
set cntrparam order 8
set style data lines
set xyplane relative 0
set nomztics
unset ztics
set title "Rosenbrock Function" 
set xlabel "x" 
set ylabel "y" 
Rosenbrock(x,y) = (1-x)**2 + 100*(y - x**2)**2
u = 0.0
x = 0.0
GPFUN_Rosenbrock = "Rosenbrock(x,y) = (1-x)**2 + 100*(y - x**2)**2"

# Achieves same effect as
#    set log z
set nonlinear z via log10(z) inverse 10**z 

splot [-1.5:1.5] [-0.5:1.5] Rosenbrock(x,y)

pause -1 "<cr> to continue"
reset
