makealtord: Creates vectors with highly distant neighbors
Description
Creates a vector of numbers 1 to n, where the neighbors are as distant as possible.
For the grey scale plot, that guarantees, that the shades of grey are easy to distinguish.
For instance, 1, 4, 2, 5, 3; all numbers have a distance of at least 2 and where possible 3.
Value
Vector of length n.