Graphics Programs Reference

In-Depth Information

>> a = zeros(2,3)

a=

0

0

0

0

0

0

>> b = ones(2,2)/2

b=

0.5000

0.5000

0.5000

0.5000

>> u = rand(1,5)

u=

0.9218

0.7382

0.1763

0.4057

0.9355

>> n = randn(5,5)

n=

-0.4326

1.1909

-0.1867

0.1139

0.2944

-1.6656

1.1892

0.7258

1.0668

-1.3362

0.1253

-0.0376

-0.5883

0.0593

0.7143

0.2877

0.3273

2.1832

-0.0956

1.6236

-1.1465

0.1746

-0.1364

-0.8323

-0.6918

>> eye(3)

ans =

1

0

0

0

1

0

0

0

1

3.4 Subscripting

Individual elements in a matrix are denoted by a row index and a column

index. To pick out the third element of the vector
u
type:

>> u(3)

ans =

0.1763

You can use the vector
[123]
as an index to
u
. To pick the first three

elements of
u
type

>> u([1 2 3])

ans =

0.9218

0.7382

0.1763

Remembering what the colon operator does, you can abbreviate this to