# rot90

Rotate array 90 degrees

## Syntax

``B = rot90(A)``
``B = rot90(A,k)``

## Description

example

````B = rot90(A)` rotates array `A` counterclockwise by 90 degrees. For multidimensional arrays, `rot90` rotates in the plane formed by the first and second dimensions.```

example

````B = rot90(A,k)` rotates array `A` counterclockwise by `k*90` degrees, where `k` is an integer.```

## Examples

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Create a column vector of sequential elements.

`A = (1:5)'`
```A = 5×1 1 2 3 4 5 ```

Rotate `A` counterclockwise by 90 degrees using `rot90`.

`B = rot90(A)`
```B = 1×5 1 2 3 4 5 ```

The result, `B`, has the same elements as `A` but a different orientation.

Create a 3-by-3-by-2 cell array of characters.

`A = cat(3,{'a' 'b' 'c';'d' 'e' 'f';'g' 'h' 'i'},{'j' 'k' 'l';'m' 'n' 'o';'p' 'q' 'r'})`
```A = 3x3x2 cell array A(:,:,1) = {'a'} {'b'} {'c'} {'d'} {'e'} {'f'} {'g'} {'h'} {'i'} A(:,:,2) = {'j'} {'k'} {'l'} {'m'} {'n'} {'o'} {'p'} {'q'} {'r'} ```

Rotate the cell array by 270 degrees.

`B = rot90(A,3)`
```B = 3x3x2 cell array B(:,:,1) = {'g'} {'d'} {'a'} {'h'} {'e'} {'b'} {'i'} {'f'} {'c'} B(:,:,2) = {'p'} {'m'} {'j'} {'q'} {'n'} {'k'} {'r'} {'o'} {'l'} ```

The function rotates each page of the array independently. Since a full 360 degree rotation (`k = 4`) leaves the array unchanged, `rot90(A,3)` is equivalent to `rot90(A,-1)`.

## Input Arguments

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Input array, specified as a vector, matrix, or multidimensional array.

Data Types: `single` | `double` | `int8` | `int16` | `int32` | `int64` | `uint8` | `uint16` | `uint32` | `uint64` | `logical` | `char` | `string` | `struct` | `cell` | `categorical` | `datetime` | `duration` | `calendarDuration`
Complex Number Support: Yes

Rotation constant, specified as an integer. Specify `k` to rotate by `k*90` degrees rather than nesting calls to `rot90`.

Example: `rot90(A,-2)` rotates `A` by -180 degrees and is equivalent to `rot90(A,2)`, which rotates by 180 degrees.

## Tips

• Use the `flip` function to flip arrays in any dimension.

• When visualizing rotated data, the coordinate system used for plotting can impact the appearance of the rotation. For example, plotting rotated data `B` using the command `imagesc(B)` followed by the command `axis xy` to automatically choose the x and y axes can cause the data to appear as though it was rotated clockwise instead of counterclockwise.

## Version History

Introduced before R2006a