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function helper_vdist(lat, lon, N)
addons = matlab.addons.installedAddons();
M1 = repmat(lat, N, 1);
M2 = repmat(lon, N, 1);
L1 = rand(N,1);
L2 = rand(N,1);
if any(addons.Name == "Mapping Toolbox")
disp("Using Mapping Toolbox distance()")
f = @() distance(lat, lon, L1, L2);
elseif ~isempty(what("matmap3d"))
disp("Using matmap3d.vdist()")
f = @() matmap3d.vdist(M1, M2, L1, L2);
else
error("Matlab Mapping Toolbox is not installed")
end
t = timeit(f);
disp(t)
end
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