MATLAB's Geographic Plots with Plotly!

Dear Gilberto,
Thank you very much for the information shared, it is very useful!
I am trying to reproduce the example exactly, but it results in an error.
I get the following message:

prueba_coordenadas
Undefined function or variable ‘geoplot’.

Error in prueba_coordenadas (line 7)
geoplot([latSeattle latAnchorage],[lonSeattle lonAnchorage],‘g-*’)

What could be wrong? Do I need an additional file?

In advance, thank you very much!

Best regards,
César.