# Gets or sets the size of a permutation

### Description

The ‘size’ of a permutation is the cardinality of the set for which it is a bijection.

### Usage

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### Arguments

`x` |
A permutation object |

`M` |
A matrix that may be coerced to a word |

`n,value` |
the size to set to, an integer |

### Details

For a `word`

object, the size is equal to the number of columns.
For a `cycle`

object, it is equal to the largest element of any
cycle.

Function `addcols()`

is a low-level function that operates on, and
returns, a matrix. It just adds columns to the right of `M`

, with
values equal to their column numbers, thus corresponding to fixed
elements. The resulting matrix has `n`

columns. This function
cannot remove columns, so if `n<ncol(M)`

an error is returned.

Setting functions cannot decrease the size of a permutation; use
`trim()`

for this.

It is meaningless to change the size of a `cycle`

object. Trying
to do so will result in an error. But you can coerce cycle objects to
`word`

form, and change the size of that.

### Author(s)

Robin K. S. Hankin

### See Also

`fixed`

### Examples

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