tf = ismap determines if the current axes is
an axesm-based map. An axesm-based map is a map
created using the axesm, worldmap, or usamap function. The function returns
1 if the current axes is an axesm-based map and
0 otherwise.
Indicator for an axesm-based map, returned as one of these values:
1 indicates that the current axes or A
is an axesm-based map.
0 indicates that the current axes or A
is not an axesm-based map.
Data Types: double
Reason why the input is not an axesm-based map, returned as a
character vector. For example, if you specify A as a
Line object, msg is 'Input is not an
axes handle.'.