diff.mondate | R Documentation |

Returns suitably lagged and iterated differences of an object of class **mondate**.

```
## S3 method for class 'mondate'
diff(x, lag = 1L, differences = 1L, ...)
```

`x` |
a mondate vector or matrix containing the values to be differenced. |

`lag` |
an integer indicating which lag to use. |

`differences` |
an integer indicating the order of the difference. |

`...` |
further arguments to be passed to or from methods. |

See the `diff`

function in `base`

.

If `x`

is a vector of length `n`

and `differences=1`

,
then the computed result is equal to the successive differences
`x[(1+lag):n] - x[1:(n-lag)]`

.

If `difference`

is larger than one this algorithm is applied
recursively to `x`

.
Note that the returned value is a vector which is shorter than `x`

.

If `x`

is a matrix then the difference operations
are carried out on each column separately.

Dan Murphy

`diff`

```
evalDate<-mondate(c(12+12*1:10)) # year ends 2001, ..., 2010
diff(evalDate) # vector of length 9 holding the number 12,
# with "timeunits" attribute = "months"
```

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