Place text on map using mouse
h = gtextm(string)
h = gtextm(string,PropertyName,PropertyValue,...)
h = gtextm(string) places the text object string at the position selected by mouse input. When this function is called, the current map axes are brought up and the cursor is activated for mouse-click position entry. The text object's handle is returned.
Create map axes:
axesm('sinusoid','FEdgeColor','red') gtextm('hello world','FontWeight','bold')
Click inside the frame and the text appears.