MATLAB by rudra pratap

96 Interactive Computation
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Figure 3.14: Contour plots of Z
ezcontour and (b) ezcontourf.
(a)
(b)
cos xcos y exp(- J(x2 + y2)/4) with (a)
Example: Here is an example of the surface plot for Z = -5/(1 + x 2 + y 2 )
over the domain lxl < 3 and IYI < 3.
Z = inline ('-5 ./(1+x . -2+y. - 2) ');
ezsurf(Z, [-3,3,-3,3])
The plot produced is similar to the one shown in Fig. 3.15 with no contours.
GYJILIII4 An even prettier looking variant of ezsurf is ezsurfc, which combines
the surface plot with its contour plot. See Fig. 3.15, which is produced with
the command ezsurf c (Z, [ -3, 3] ) for the same function Z, as specified in
the preceding ezsurf example.
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Figure 3.15: 3-D surface plot of Z = -5/(1 + x2 + y2) with ezsurfc.
There are two more functions in the ez stable, ezmesh and ezmeshc, that are
used for 3-D plotting. These functions work exactly like the surface plotting
functions except that they create the 3-D graphs with wireframe meshes rather
than surface pat.ches.