i dlove to tell abit more the earon why iam going headache & sick even dying for ALGORITHMs of MATLAB. actually iam learning for a master.. then iam in a period of the topic. & MaTLab is the TOOL for me to PROCESS of the methods: FEM ( finite element method) & PGD( proper generalized decomposition). so its the big problem of my life wile studying for master with the topic . BUt i dont understand why MORE & MORE reading LESS& LESS understand. iam really goin into crisis . yes, sorry for some shares to all. Hope all can get sthing to reach my mood for all questions in forum. thanks for attention to al.