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# flipud

Flip array up to down

## Description

example

B = flipud(A) returns A with its rows flipped in the up-down direction (that is, about a horizontal axis).

If A is a column vector, then flipud(A) returns a vector of the same length with the order of its elements reversed. If A is a row vector, then flipud(A) simply returns A. For multidimensional arrays, flipud operates on the planes formed by the first and second dimensions.

## Examples

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### Flip Column Vector

Create a column vector.

`A=(1:10)'`
```A =

1
2
3
4
5
6
7
8
9
10
```

Use flipud to flip the elements of A in the vertical direction.

`B = flipud(A)`
```B =

10
9
8
7
6
5
4
3
2
1```

The order of the elements in B is reversed compared to A.

### Flip Cell Array of Strings

Create a 3-by-3 cell array of strings.

`A = {'a' 'b' 'c'; 'd' 'e' 'f'; 'g' 'h' 'i'}`
```A =

'a'    'b'    'c'
'd'    'e'    'f'
'g'    'h'    'i'```

Change the order of the rows in the vertical direction by using flipud.

`B = flipud(A)`
```B =

'g'    'h'    'i'
'd'    'e'    'f'
'a'    'b'    'c'```

The order of the first and third rows of A is switched in B, while the second row remains unchanged.

### Flip Multidimensional Array

Create a multidimensional array.

`A = cat(3, [1 2; 3 4], [5 6; 7 8])`
```A(:,:,1) =

1     2
3     4

A(:,:,2) =

5     6
7     8```

A is an array of size 2-by-2-by-2.

Flip the elements on each page of A in the vertical direction.

`B = flipud(A)`
```B(:,:,1) =

3     4
1     2

B(:,:,2) =

7     8
5     6```

The result, B, is the same size as A, but the vertical order of the elements is flipped. The operation flips the elements on each page independently.

## Input Arguments

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### A — Input arrayvector | matrix | array | cell array | categorical array | table

Input array, specified as a vector, matrix, array, cell array, categorical array, or table of any data type.

Complex Number Support: Yes

## More About

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### Tips

• flipud(A) is equivalent to flip(A,1).

• Use the fliplr function to flip arrays in the horizontal direction (that is, about a vertical axis).

• The flip function can flip arrays in any direction.

## See Also

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