shift: function that shifts vector values to right or left
Description
function that shifts vector values to right or left
Usage
shift(x, n = 0, default = NA, invert = FALSE)
Arguments
x
Vector for which to shift values
n
Number of places to be shifted.
Positive numbers will shift to the right by default.
Negative numbers will shift to the left by default.
The direction can be inverted by the invert parameter.
default
The value that should be inserted by default.
invert
Whether or not the default shift directions
should be inverted.