Fixes the scaling for subsequent graphs. The axes endpoints and increments are computed as a best guess based on the data passed to it.
This function is for use with the deprecated PQG graphics.
x and y must each have at least 2 elements. Only the minimum and maximum values are necessary.
If either of the arguments is a scalar missing, the main graphics function will set the scaling for that axis using the actual data.
If an argument has 2 elements, the first will be used for the minimum and the last will be used for the maximum.
If an argument has 2 elements, and contains a missing value, that end of the axis will be scaled from the data by the main graphics function.