xgraduate — axis graduation
[xi,xa,np1,np2,kMinr,kMaxr,ar]=xgraduate(xmi,xma)
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.