axis graduation
[xi, xa, np1, np2, kMinr, kMaxr, ar] = xgraduate(xmi, xma)
real scalars.
real scalars.
integers.
xgraduate returns the axis graduations which are
used by the plot routines (with pretty print flag enabled). It
returns an interval [xi, xa] which contains the
given interval [xmi,xma] and such that
xi= kMinr*10^ar, xa=kMaxr*10^ar
and the interval can be divided into np2 intervals
and each interval is divided in np1 sub-intervals.