The ezsurfc function is the same as ezsurf except that a contour plot is drawn underneath the plot of f.

The ezsurfc(f) plots a three-dimensional surface.  When g and h are specified, a parametric surface plot will be generated.

xmin and xmax denote the left and right endpoints of the horizontal range.  ymin and ymax denote the vertical endpoints.  When xmax = ymax and xmin = ymin, the two number min, max form can be used.  When omitted, the default range is -Pi .. Pi.

When three expressions are given as the first arguments in the ezsurfc calling sequence, an implicitplot3d of f(s,t), g(s,t) and h(s,t) is generated.  

When f, g or h are not functions of x, y, indets is used to find the indeterminates.  The range limits correspond to the order of alphabetically sorted indeterminates.

Specifying the gridsize option generates a plot over the grid region, gridsize x gridsize.

Specifying the 'circ' option causes the plot to be generated over a disk.