4.8) Accessing Data
- Arrays contain data. We can access parts of an array using the index numbers (or indices)
- Index numbers represent specific positions within an array. For example, let's first create a column vector with 40 elements
- Now let's access elements of the vector
[matlab]
>> a=[0.25:0.25:10]
[/matlab]
[matlab]
>> a(5)
ans=1.25
[/matlab]
[matlab]
>> a(10:12)
ans= 2.50 2.75 3.00
[/matlab]
Let's access the 1st, 5th and 25th elements of the vector.
[matlab]
>> a([1,5,25])
[/matlab]
Let's access the 1st, 3rd, 5th and 7th elements of the vector.
[matlab]
>> a([1:2:7])
ans= 0.25 0.75 1.25 1.75
[/matlab]
[matlab]
>> a(41)
Index exceeds matrix dimensions
[/matlab]
We cannot access the 41st element of the vector because the vector has only 40 elements.