# # 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 # 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
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