Three-Dimensional Graphics, Warped Curves and Surfaces, Contour Graphics - MATLAB Graphical Programming - page 55

To represent a mesh graph, use the command mesh and its variants, whose syntax are as follows:
mesh(X,Y,Z,C) represents the graph of the mesh function z = f(x,y) , drawing the grid lines
that compose the mesh with the colors specified in C . The C argument is optional.
meshz(X,Y,Z,C) represents the graph of the mesh function z = f(x,y) with a curtain around
the perimeter of the grid that drops to the bottom of the z-axis giving the impression of a
draped tablecloth.
meshc(X,Y,Z,C) represents the graph of the mesh function z = f(x,y) along with a
corresponding contour chart like surfc above (with contour lines projected onto the
XY -plane).
eXerCISe 3-2
represent the mesh graph for the surface of equation:
z = xe (-x ^ 2 - y ^ 2) - 2 < x, y < 2
also add their contours (a contour chart) and include a curtain.
the syntax presented here gives as a result the graph in figure 3-7 :
>> [X, Y] = meshgrid(-2:.1:2,-2:.1:2);
>> Z = X .* exp(-X.^2 - Y .^2);
>> mesh(X, Y, Z)
Figure 3-7.
figure 3-8 presents the mesh along with the contour graph (or contour chart) for the syntax as follows:
>> [X, Y] = meshgrid(-2:.1:2,-2:.1:2);
>> Z = X .* exp(-X.^2 - Y .^2);
>> meshc(X, Y, Z)