# # $Id: contours.dem,v 1.13 2006/06/25 17:24:32 sfeam Exp $ # set samples 20 set isosamples 21 set xlabel "X axis" set ylabel "Y axis" set zlabel "Z axis" offset 1, 0 set view 60, 30, 0.85, 1.1 set title "3D gnuplot demo - contour plot" set contour splot x*y |

set cntrparam levels 20 set title "3D gnuplot demo - contour plot (more contours)" replot |

set cntrparam levels incr -100,10,100 set title "3D gnuplot demo - contour plot (every 10, starting at -100)" replot |

set cntrparam levels disc -75,-50,0 set title "3D gnuplot demo - contour plot (at -75, -50, 0)" replot |

set cntrparam levels auto 10 set title "3D gnuplot demo - contour plot on base grid" set contour base splot x**2-y**2 |

set title "3D gnuplot demo - contour plot on surface" set contour surface replot |

set title "3D gnuplot demo - contour plot on both" set contour both replot |

set contour base set title "3D gnuplot demo - 2 surfaces" splot x**2*y**3, x**3*y**2 |

set title "3D gnuplot demo - some more interesting contours" splot x*y / (x**2 + y**2 + 0.1) |

splot [x=-3:3] [y=-3:3] sin(x) * cos(y) |

set zrange [-1.0:1.0] replot |

set samples 6 set isosamples 6 set cntrparam levels 5 set title "3D gnuplot demo - low resolution (6x6)" replot |

set cntrparam bspline set title "3D gnuplot demo - low resolution (6x6) using bspline approx." replot |

set cntrparam order 8 set title "3D gnuplot demo - low resolution (6x6) raise bspline order." replot |

set cntrparam linear set auto set title "3D gnuplot demo - low resolution (6x6) using linear contours." splot x*y |

set cntrparam order 4 set cntrparam bspline set title "3D gnuplot demo - low resolution (6x6) using bspline approx." replot |

set samples 25 set isosamples 26 set title "3D gnuplot demo - contour of Sinc function" splot [-5:5.01] [-5:5.01] sin(sqrt(x**2+y**2)) / sqrt(x**2+y**2) |

splot [-12:12.01] [-12:12.01] sin(sqrt(x**2+y**2)) / sqrt(x**2+y**2) |

set cntrparam levels 10 set auto set zrange [-1.0:1.0] set style data lines set title "3D gnuplot demo - contour of data grid plotting" set parametric splot "glass.dat" |

set xrange [0:15] set yrange [0:15] set zrange [-1.2:1.2] unset parametric splot "glass.dat" using 1 |

set view map unset surface set title "3D gnuplot demo - 2D contour projection of last plot" replot |

#From: shen@athena.cs.uga.edu (Mingzuo Shen) #Subject: Rosenbrock's function: some answers and thanks #Date: Wed, 23 Jun 1993 20:50:36 GMT # # Last night I asked for help with a contour plot for the function: # # (1-x)**2 + 100 * (y - x**2)**2 # #which should have a minimum at (x=1,y=1). This is the 2D case of a more #general function named after Rosenbrock (the book I am reading does not #give a reference to any paper/book by this person): # # for even integer n, # # f(x) = \sum_{j=1,3,5,\ldots,n} [(1 - x_j)^2 + 100(x_{j+1} - x_j^2)^2] # #where x is a vector (x1, x2, ..., x_n). This function also have a minimum #at (1,1,...,1), which lies at the base of a "banana-shaped valley". #Here are the new commands I have tried. # set auto set surface unset contour set cntrparam levels 5 set cntrparam linear set samples 100 set logscale z set hidden3d set isosamples 20 set view 70,335,1,1 set xlabel "x" set ylabel "y" set title "Rosenbrock Function" splot [0.9:1.1] [0.9:1.1] (1-x)**2 + 100*(y - x**2)**2 |

set logscale z set hidden3d set isosamples 60 set ticslevel 0. set view 20,340 #HBB: ,1,2 set xlabel "x" set ylabel "y" splot [-1.5:1.5] [-0.5:1.5] (1-x)**2 + 100*(y - x**2)**2 |

set contour unset surface unset ztics unset zlabel set border 15 replot |

# set title "All contours drawn in a single color" unset clabel splot [-1.5:1.5] [-0.5:1.5] (1-x)**2 + 100*(y - x**2)**2 with lines lc rgb "#007700" |

# # Clean up: # reset |