how to calculate the distance of a lat lon to the coastline?

hello, I want to find the distance from the lat lat station to the coastline. following my script, but there was an error that I did not understand, I thank anyone who provided advice and helped me.

lonlat = load ('lonlat.mat');%get lonlat allstasiun
coast = load('coast.dat');
% % Preallocate
coast_indexes = size(lonlat);
distancefromcoast = size(lonlat);
% % Find distance and corresponding coastal point  
for i=1:1:numel(lonlat)  
    [dist, az] = distance(lonlat(i), lonlat(i), coast.lat, coast.long);
    [distancefromcoast(i),coast_indexes(i)] = min(dist);
end

[darova]

Can't run this code. SOme problems appear

[Meg Noah]

Please share 'lonlat.mat'

[Melih Can]

Should be 'coast.mat' also distance('lonlat(i),lonlat(i)'... does'nt look appropriate

Answer 1

[David Hill]

Technically, you should use spherical trigonometry (great circle path) to determine the shortest distance. The algorithm is not difficult. You could solve my Cody problem: https://www.mathworks.com/matlabcentral/cody/problems/45180