can't use function m_lldist

i am told and have been shown this function working however when i copy and paste a already none to work code, in my command window on my mac it doesn't run. the function [dist,lons,lats] = m_lldist(long,lat,N). undefined function pops up why?

Answer 1

[Kelly Kearney]

The m_lldist function is part of the m_map toolbox, which is available here.