%% XYZ plots in MATLAB.
%   Here are some examples of surface plots in MATLAB.

%   Copyright 1984-2004 The MathWorks, Inc.
%   $Revision: 5.15.4.4 $  $Date: 2004/07/12 18:09:17 $

%% Mesh Plot of Peaks

z=peaks(25);
mesh(z);
colormap(hsv)

%% Surface Plot of Peaks

z=peaks(25);
surf(z);
colormap(jet);

%% Surface Plot (with Shading) of Peaks

z=peaks(25);
surfl(z);
shading interp;
colormap(pink);

%% Contour Plot of Peaks

z=peaks(25);
contour(z,16);
colormap(hsv)

%% Quiver

x = -2:.2:2; 
y = -1:.2:1;
[xx,yy] = meshgrid(x,y);
zz = xx.*exp(-xx.^2-yy.^2);
[px,py] = gradient(zz,.2,.2);
quiver(x,y,px,py,2);

%% Slice

[x,y,z] = meshgrid(-2:.2:2,-2:.25:2,-2:.16:2);
v = x.*exp(-x.^2-y.^2-z.^2);
xslice = [-1.2,.8,2]; yslice = 2; zslice = [-2,0];
slice(x,y,z,v,xslice,yslice,zslice)
colormap hsv