Calculate circular difference.

## Usage

`getCircDiff(x, y, period = 1, towardZero = TRUE)`

## Arguments

- x
Numeric vector or matrix.

- y
Numeric vector or matrix.

- period
Period of the periodic variable.

- towardZero
If `TRUE`

, returned values will be between `-period / 2`

and `period / 2`

. If `FALSE`

, returned values will be between 0 and `period`

.

## Value

Vector or matrix corresponding to `x - y`

.