Create axes in tiled positions.
SUBPLOT(m,n,p), or SUBPLOT(mnp), breaks the Figure window into
an m-by-n matrix of small axes, selects the p-th axes for
for the current plot, and returns the axis handle. The axes
are counted along the top row of the Figure window, then the
second row, etc. For example,
SUBPLOT(2,1,1), PLOT (income)
SUBPLOT(2,1,2), PLOT (outgo)
plots income on the top half of the window and outgo on the
SUBPLOT(m,n,p), if the axis already exists, makes it current.
SUBPLOT(H), where H is an axis handle, is another way of making
an axis current for subsequent plotting commands.
If a SUBPLOT specification causes a new axis to overlap an
existing axis, the existing axis is deleted. For example,
the statement SUBPLOT(1,1,1) deletes all existing smaller
axes in the Figure window and creates a new full-figure axis.