Wiki上就有答案....呃.....您太誇張了些,會唸到跟Wavelet有關東西的,應該是大四、研究生或已經就業了?怎麼找資料能力還....呃.....(1) a zerotree rxxx(2) an ixxxxxxd zero(3) a sxxxxxxxxxt positive cxxxxxxxxxt(4) a sxxxxxxxxxt negative cxxxxxxxxxt