In the tip 29 two methods of
construction of the X-Y Plot graph in Mathcad were described – three-cycle and
two-cycle processes. But in a number of cases it is possible to construct a
graph for *one step*.

In the fig. 73 the X-Y Plot is constructed where not
functions and arguments (variables) but the vectors are written near the axes x and y. Every vector has four
real arguments. In the fig. 73 the problem
about a win of an “old woman” on roulette from “Gambler” of F.M. Dostoevsky is
solved graphically (see the sketch “Mathcad and some secrets of literature” – http://twt.mpei.ac.ru/ochkov/Gerasim/Gerasim.htm).