Zoom in and out on scene
camzoom(zoom_factor)
camzoom(axes_handle,...)
camzoom(zoom_factor) zooms
in or out on the scene depending on the value specified by zoom_factor.
If zoom_factor is greater than 1, the scene appears
larger; if zoom_factor is greater than zero and
less than 1, the scene appears smaller.
camzoom(axes_handle,...) operates
on the axes identified by the first argument, axes_handle.
When you do not specify an axes handle, camzoom operates
on the current axes.