function long = lon360(long)
%Èçìåíåíèå ïðåäåëîâ äîëãîò ñ [-180...+180] â [0...360]
%
%Âûçîâ:  long = lon360(long)
%
%     long - íà âõîäå âåêòîð äîëãîò (-180...180), íà
%            íà âûõîäå - long+360 (åñëè long<0)

k = long<0;
long(k) = long(k)+360;
