function?[r?w]?=?Gauss（l）
%?RETURN?COORDINATES?OF?GAUSS?QUADRATURE?POINTS?AND?THEIR?WEIGHTS
%
%?SYNTAX:?[r?w]?=?Gauss（l）
%
%?INPUT?PARAMETERS
%????l?-?Order?of?Gauss?quadrature?（?1?=%
%?OUTPUT?PARAMETERS
%????r?-?Coordinates?of?Gauss?quadrature?points
%????w?-?Weights?at?Gauss?quadrature?points
%
xg?=?[
???????????????0.0??????????????0.0??????????????0.0??????????????0.0??????????????0.0??????????????0.0??????????????0.0??????????????0.0??????????????0.0??????????????0.0
??-0.5773502691896??0.5773502691896??????????????0.0??????????????0.0??????????????0.0	????????????0.0??????????????0.0??????????????0.0??????????????0.0??????????????0.0
??-0.7745966692415??0.0000000000000??0.7745966692415??????????????0.0??????????????0.0	????????????0.0??????????????0.0??????????????0.0??????????????0.0??????????????0.0?
??-0.8611363115941?-0.3399810435849??0.3399810435849??0.8611363115941??????????????0.0	????????????0.0??????????????0.0??????????????0.0??????????????0.0??????????????0.0
??-0.9061798459387?-0.5384693101057??????????????0.0??0.5384693101057??0.9061798459387??????????????0.0??????????????0.0??????????????0.0??????????????0.0??????????????0.0?
??-0.9324695142032?-0.6612093864663?-0.2386191860832??0.2386191860832??0.6612093864663??0.9324695142032??????????????0.0??????????????0.0??????????????0.0??????????????0.0?
??-0.9491079123428?-0.7415311855994?-0.4058451513774??????????????0.0??0.4058451514774	0.7415311855994??0.9491079123428??????????????0.0??????????????0.0??????????????0.0
??-0.9602898564975?-0.7966664774136?-0.5255324099163?-0.1834346424957??0.1834346424957	0.5255324099163??0.7966664774136??0.9602898564975??????????????0.0??????????????0.0?
??-0.9681602395076?-0.8360311073266?-0.6133714327006?-0.3242534234038??????????????0.0	0.3242534234038??0.6133714327006??0.8360311073266??0.9681602395076??????????????0.0
??-0.9739065285172?-0.8650633666890?-0.6794095682990?-0.433395394129