Graphics Programs Reference
In-Depth Information
x=
-1
0
1
-1
0
1
-1
0
1
y=
1
1
1
2
2
2
3
3
3
This set of points defines a rectangular domain because the rows of
x
are identical and the columns of
y
are identical. We can make a plot of
the points (as we did on page 25):
clf
plot(x,y,'.')
Now let us change the
y
matrix a bit:
>> y = [[1; 2; 3] [1; 1.5; 2] [0; .2; .4]]
y=
1.0000
1.0000
0
2.0000
1.5000
0.2000
3.0000
2.0000
0.4000
The plot of this data looks like a bent triangle:
plot(x,y,'.')
To define a surface over this domain we simply have to supply the
z
values. We can start by simply defining a constant
z
:
