# Pad array

pad_array | |

Pads an array with zeroes in a similar way to padarray in MATLAB. | |

Other toolboxes required | none |
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Function category | Helper functions |

This is a helper function that only exists to aid other functions in QETLAB. If you are an end-user of QETLAB, you likely will never have a reason to use this function. |

` pad_array` is a function that takes an array and either prepends or postpends a number of zeroes specified by the function call.

## Syntax

`BIN = pad_array(ARR, PAD_NUM, DIR)`

## Argument descriptions

`ARR`: The array which will have zeroes padded onto it.`PAD_NUM`: The number of zeroes to either prepend or postpend onto`ARR`. This must be a non-negative integer.`DIR`: An integer specifying whether to prepend or postpend the zeroes onto`ARR`. 0 means to prepend, 1 means to postpend, and any other number will throw an error.

## Examples

A basic example of how pad_array works.

```
>> arr = [1,2,3,4];
>> pad_array(arr, 2, 0)
ans =
0 0 1 2 3 4
>> pad_array(arr, 2, 1)
ans =
1 2 3 4 0 0
```

## Notes

This function is only meant to simplify code within other functions without the need to install the image processing package of MATLAB or Octave-Forge. Note that this function only pads with zeroes. If other numbers are required, please use the `padarray' function within the image processing toolbox of MATLAB or Octave-Forge.

## Source code

Click on "expand" to the right to view the MATLAB source code for this function.