ROOT_NAME get root name

ROOT_NAME(P) returns the root name of P. root_name is the drive letter on Windows without the trailing slash or an empty string if P is not an absolute path. on non-Windows platforms, root_name is always an empty string.

function r = root_name(p)

c = char(p);

if ispc() && ~isempty(regexp(c, '^[A-Za-z]:', 'once'))
  r = c(1:2);
else
  r = '';
end

if isstring(p)
  r = string(r);
end

end

%!test
%! if ispc()
%!   assert(strcmp(strcmp.root_name('c:/hi'), 'c:'))
%! else
%!   assert(strcmp(stdlib.root_name('/a/.bc'), ''))
%! end

Published with MATLAB® R2025a