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B=[1+4i,4,3,6,7,8;2,3,3,5,5,4+2i;2,6+7i,5,3,4,2;1,8,9,5,4,3]; C=A*B; D=C(4:5,4:6); whos
Name Size Bytes Class Attributes A 5x4 160 double B 4x6 384 double complex C 5x6 480 double complex
D 2x3 96 double complex 2 Ñ¡ÔñºÏÊʵIJ½¾à»æÖƳöÏÂÃæµÄͼÐÎ £¬ÆäÖÐ sin(/)1tt,,(,)11 t=[-1:0.1:1]; y=sin(1./t); plot(t,y) 1
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A=[7.5,3.5,0,0;8,33,4.1,0;0,9,103,-1.5;0,0,3.7,19.3];
B=[5,7,6,5;7,10,8,7;6,8,10,9;5,7,9,10]; C=[1:4;5:8;9:12;13:1rtf6]; D=[3,-3,-2,4;5,-5,1,8;11,8,5,-7;5,-1,-3,-1]; det(A);det(B);det(C);det(D);
rank(A);
rank(B); rank(C); rank(D); a=poly(A); b=poly(B); c=poly(C); d=poly(D); norm(A); 2 norm(B); norm(C); norm(D);
[v,d]=eig(A,'nobalance'); [v,d]=eig(B,'nobalance'); [v,d]=eig(C,'nobalance'); [v,d]=eig(D,'nobalance'); m=inv(A); n=inv(B); p=inv(C); q=inv(D);
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