True for axes with map projection
mflag = ismap
mflag = ismap(hndl)
[mflag,msg] = ismap(hndl)
mflag = ismap returns a
1 if the current axes is a map axes, and 0 otherwise.
mflag = ismap(hndl) specifies
the handle of the axes to be tested.
[mflag,msg] = ismap(hndl) returns the character
vector msg if the axes is not a map axes, specifying
why not.
The ismap function tests an axes object
to determine whether it is a map axes.