If both the vertical and horizontal specifications request more than one variable and if a
variable appears in both lists, then it will not be plotted against itself. For example, the
following statement does not plot B*B and C*C:
plot (a b c)*(b c d);
Specifying Combinations of Variables
The operator in request is either an asterisk (*) or a colon (:). An asterisk combines the
variables in the lists to produce all possible combinations of x and y variables. For
example, the following plot requests are equivalent:
plot (y1-y2) * (x1-x2);
plot y1*x1 y1*x2 y2*x1 y2*x2;
A colon ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.