数值分析计算机作业

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1、数值分析计算机作业电信少41刘星辰21204061021.用列主元高斯消去法求解线性方程组_3-564-2-38_111-9151—9222-175-161129A=-11327-1-2,b=9431-7211529-811-1-4-18_72-127-1925解：代码如下functionx=nagauss2(aAflag)a=[3-5611-92-174-2-38;151-92;5-1611;-11327-1-2431-7211;29-811-1一4-1;72-127-19];b=[ll;2;29;9;5;8;25];ifnargin<3,flag=0;e

2、ndn=length(b);a=[ab];fork=l:n-1%选主元[aprp]=max(abs(a(k:n,k)));p=p+k_l;ifp>ka(kz:)=a(p,:);a(p,:)end%消元a((k+1):nz(k+1):(n+1))=a((k+1):nz(k+1):(n+1))-a((k+1):nzk)/a(kzk)*a(k,(k+1):(n+1));a((k+1):nzk)=zeros(n-k^1);ifflag==0za,endend%回代x=zeros(nz1);x(n)=a(n^n+1)/a(nzn);fork=n-l:-1:1x(k,:

3、)=(a(k,n+1)-a(kz(k+1):n)*x((k+1):n))/a(kzk);end过程截图：a=7.00002.0000-1.00002.000008.4286-7.714310.4286005.84756.3729004.03390.6949003.2712-10.440700-8.203413.8305001.067810.38987.00002.0000-1.00002.000008.4286-7.714310.428600-8.203413.83050007.4959000-4.925600016.231400012.19017.0000

4、-1.00009.000025.0000-3.0000-3.7143-3.57140.8571-3.55935.59327.762722.01698.4576-0.5763-0.169512.4407-1.33902.3898-3.3559-9.47460.2542-8.54241.0169-1.6441-7.0847-5.15251.66100.88147.0000-1.00009.000025.0000-3.0000-3.7143-3.57140.85710.2542-8.54241.0169-1.64418.5826-4.77690.330611.63

5、22-1.2376-1.0165-2.9504-10.1302-3.3781-0.49598.487620.8450-7.0517一6.26451.79340.66747.00002.0000-1.00002.00007.0000-1.00009.000025.000000.7143_8.857114.71430_8・85710.7143-1.57140-1.571428574.4286-3.00006.28578.428621.857101.28572.85712.28578.0000-1.1429-0.714312.571401.85711.5714一8

6、.1429-2.00001.5714-4.1429-9.28570S.4286■f•714310.4286-3.0000-3・7143-3.57140.85710-5.85716.42863.1429-5.0000_2.57144.14290.28577.00002.0000-1.00002.00007.0000-1.00009.000025.000008.4286-7.714310.4286-3.0000-3.7143-3.57140.857100-8.203413.83050.2542-8.54241.0169-1.644100016.2314-3.37

7、81-0.49598.487620.84500000-2.2627-1.1670-0.3747-3.8045000010.1427-4.5479-3.58912.00570000-4.5146-5.8921-4.5810-14.98777.00002.0000-1.00002.00007.0000-1.00009.000025.000008.4286-7.714310.4286-3.0000-3.7143-3.57140.857100-8.203413.83050.2542-8.54241.0169-1.644100016.2314-3.3781-0.495

8、98.487620.8450000010.1427-