Elements of the same class can often be concatenated into arrays (with a few rare exceptions, e.g. function handles). Numeric scalars, by default of class `double`

, can be stored in a matrix.

```
>> A = [1, -2, 3.14, 4/5, 5^6; pi, inf, 7/0, nan, log(0)]
A =
1.0e+04 *
0.0001 -0.0002 0.0003 0.0001 1.5625
0.0003 Inf Inf NaN -Inf
```

Characters, which are of class `char`

in MATLAB, can also be stored in array using similar syntax. Such an array is similar to a string in many other programming languages.

```
>> s = ['MATLAB ','is ','fun']
s =
MATLAB is fun
```

Note that despite both of them are using brackets `[`

and `]`

, the result classes are different. Therefore the operations that can be done on them are also different.

```
>> whos
Name Size Bytes Class Attributes
A 2x5 80 double
s 1x13 26 char
```

In fact, the array `s`

is not an array of the strings `'MATLAB '`

,`'is '`

, and `'fun'`

, it is just one string - an array of 13 characters. You would get the same results if it were defined by any of the following:

```
>> s = ['MAT','LAB ','is f','u','n'];
>> s = ['M','A','T','L','A','B,' ','i','s',' ','f','u','n'];
```

A regular MATLAB vector does not let you store a mix of variables of different classes, or a few different strings. This is where the `cell`

array comes in handy. This is an array of cells that each can contain some MATLAB object, whose class can be different in every cell if needed. Use curly braces `{`

and `}`

around the elements to store in a cell array.

```
>> C = {A; s}
C =
[2x5 double]
'MATLAB is fun'
>> whos C
Name Size Bytes Class Attributes
C 2x1 330 cell
```

Standard MATLAB objects of any classes can be stored together in a cell array. Note that cell arrays require more memory to store their contents.

Accessing the contents of a cell is done using curly braces `{`

and `}`

.

```
>> C{1}
ans =
1.0e+04 *
0.0001 -0.0002 0.0003 0.0001 1.5625
0.0003 Inf Inf NaN -Inf
```

Note that `C(1)`

is different from `C{1}`

. Whereas the latter returns the cell's content (and has class `double`

in out example), the former returns a cell array which is a sub-array of `C`

. Similarly, if `D`

were an 10 by 5 cell array, then `D(4:8,1:3)`

would return a sub-array of `D`

whose size is 5 by 3 and whose class is `cell`

. And the syntax `C{1:2}`

does not have a single returned object, but rater it returns 2 different objects (similar to a MATLAB function with multiple return values):

```
>> [x,y] = C{1:2}
x =
1 -2 3.14 0.8 15625
3.14159265358979 Inf Inf NaN -Inf
y =
MATLAB is fun
```

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