Graphics Programs Reference
In-Depth Information
hold on
plot3(x(ind),y(ind),z(ind),'.')
The
x, y
domain of the extracted points can be shown clearly with an
overhead view:
view(2)
xyz
shading flat
The associated
z
values can be shown with a side view:
view(90,0)
grid
7.6 Nonrectangular Surface Domains
The
polarmesh
function given on page 26 showed a conical function
defined over a circular domain of
x
and
y
points. Let us now look a
bit more generally at how to define such nonrectangular domains for
surfaces.
The standard matlab functions, including graphics functions, tend
to like working with rectangular matrices: each row must have the same
number of columns. For surfaces, this requirement applies to the
x
,
y
and
z
matrices that specify the surface. Let us demonstrate by way of
an example. First we generate a rectangular domain of
x
and
y
points,
with
x
going from
−
1to1,and
y
going from 0 to 2:
>> [x,y] = meshgrid(-1:1,1:3)
