When to use {}, [], or () …

{} Use to define AND index cell arrays. These are use exclusively for cell arrays. Recall cell arrays can store elements of different size and/or type.

Defining cell array:

x={ 'one ', 'two ', 'three ',4,5,6}

Indexing cell array:

x{1}

x{4}

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[] Use to define a standard array. Used to create an array. Often used to create an array from the output of a function.

y=[1:10]

y=['a', 'b', 'c']

y=[1 2 3

4 5 6

7 8 9]

[x,fs]=wavread('filename.wav');

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() Use to index a standard array and to provide inputs to functions

z=[5,7,9,2,4,5];

z(1) z( [1,3,4] )

z(3)

z(2:4)

z(:)

A=[1 2 3 4 5

6 7 8 9 10

1 2 3 4 5];

A(1,1) A( [2,3], [1,2,4] )

A( 1:2,1:2)

A(:,1)

A(1,:)

[x,fs]=wavread('filename.wav');

sin(x)

cos(x)