10 lines
200 B
Matlab
10 lines
200 B
Matlab
x=(0:pi/100:2*pi)';
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y1=2*exp(-0.5*x)*[1,-1];
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y2=2*exp(-0.5*x).*sin(2*pi*x);
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plot(x,y1,'b:');
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axis([0,2*pi,-2,2]);
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hold on;
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plot(x,y2,'k');
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legend('包络线','包络线','曲线y');
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hold off;
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grid on; |