Page 45 - Basics of MATLAB and Beyond

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:

c 2000 by CRC Press LLC