Takes the k-th order differences

Diff(x, lag = 1, k = 1, axis = 2)

## Arguments

x

An Expression that represents a vector

lag

The degree of lag between differences

k

The integer value of the order of differences

axis

The axis along which to apply the function. For a 2D matrix, 1 indicates rows and 2 indicates columns.

## Value

Takes in a vector of length n and returns a vector of length n-k of the kth order differences