function a = remove(a,idx)if ~a.n, return, endif isempty(idx), return, enda.con(idx,:) = [];a.bus(idx) = [];a.vbus(idx) = [];a.n = a.n - length(idx);a.slip(idx) = [];a.e1r(idx) = [];a.e1m(idx) = [];a.e2r(idx) = [];a.e2m(idx) = [];a.u(idx) = [];a.z(idx) = [];a.dat(idx,:) = [];