Diff-int function

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.

Returns

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