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biss committed 2025-11-17 11:16:02 +08:00
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% 第一题
A=[3,4,-7,-12;5,-7,4,2;1,0,8,-5;-6,5,-2,10];
B=[4;-3;9;-8];
% 系数矩阵的秩
rank(A)
% 方程的解
C = A\B
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% 练习3 第二题
x=-10:1:10;
y=-10:1:10;
[X,Y]=meshgrid(x,y);
Z=sin(sqrt(X.^2+Y.^2))./(sqrt(X.^2+Y.^2));
surf(X,Y,Z)
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num=[1];
den=[1 2 2 1];
sys=tf(num,den);
figure(1); pzmap(sys); title('零极点图');
figure(2); impulse(sys);
w=0:0.1:10*pi;
figure(3); freqs(num,den,w)
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