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
: