Programming and Graphics

F.4Elementary examples 349

• Numerical value assignment and subtraction:

>> clear

>> a=1; b=-3; c=a-b

c=

4

• Number multiplication:

>> clear

>> a = 2.0; b=-3.5; c=a*b;

>> c

c=

-7

Typing the variablecdisplays its current value, in this case -7.

• Vector definition:

>> clear

>>v=[21]

v=

21

>> v(1)

ans =

2

>> v’ % transpose

ans =

2

1

Typingv(1)produces the first component of the vectorvas an answer. The
comment “transpose” is ignored since it is preceded by the comment delimiter
“%.” The answeransis, in fact, a variable evaluated byMatlab.

• Vector addition:

>>v=[12];u=[-1,-2];u+v

ans =

00