gname does work for interactive labeling (at least in R2023a) for points plotted with geoplot. Any other suggestions?

In R2023a the gname function throws an error ("Unrecognized property Xlim for class GeographicAxes") when attempting to interactively label points on a map figure generated with the geoplot command. I could write my own interactive point labeling tool based on gtext, but .... any other suggestions before I go that route? Here's an example :

  % Put 3 points on a map with geoplot
  figure; 
  subplot(121)
  geoplot([40:5:50],[-104:-10:-125],'o', 'MarkerFaceColor','b'); 
  geobasemap streets
 
  % Try to Label them with gname --- this will throw an error
  try
    gname({'1st','2nd','3rd'})
  catch ME
    fprintf('gname failed with exception:')
    display(ME)
  end
  
  % Plot the same points on regular plot
  subplot(122)
  plot([-104:-10:-125],[40:5:50],'o', 'MarkerFaceColor','b'); 
  xlabel('Latitude'); ylabel('Longitude')
  
  % Labeling them with gname works fine
  gname({'1st','2nd','3rd'})

Answer 1

[Suraj Kumar]

Hi David ,

You can use “gname” function to label plots created by “plot” ,“scatter” ,”gscatter” ,”plotmatrix” and “gplotmatrix”. But not for plots created by “geoplot”.

This is due to the differences in the underlying data types, coordinate systems, and plot handling between standard MATLAB plots and geographic plots.

A workaround for labeling points on geographic plots would be to use “gtext” function with latitude and longitude coordinates.

figure;   
  subplot(121)  
  geoplot([40:5:50],[-104:-10:-125],'o', 'MarkerFaceColor','b');   
  geobasemap streets 

 % Labelling the points on the geoplot  
    gtext({'1st';'2nd';'3rd'}) 
 
  % Plot the same points on regular plot  
  subplot(122)  
  plot([-104:-10:-125],[40:5:50],'o', 'MarkerFaceColor','b');   
  xlabel('Latitude'); ylabel('Longitude')  

  % Labeling them with gname works fine  
  gname({'1st','2nd','3rd'}) 

You might find these resources helpful:

1. https://www.mathworks.com/help/stats/gname.html
2. https://www.mathworks.com/help/matlab/ref/gtext.html

Hope this helps!