IS_ABSOLUTE is path absolute

Windows, absolute paths must be at least 3 character long, starting with a root name followed by a slash

non-Windows, absolute paths must start with a slash

function y = is_absolute(p)
arguments
  p string
end

y = false(size(p));

i = ~stdlib.strempty(stdlib.root_dir(p));

y(i) = true;

if ispc()
  y(i) = ~stdlib.strempty(stdlib.root_name(p(i)));
end

end