(4)
t = -1:0.01:5;
y = (1 + cos(pi * t)).* ((t>=0) - ((t-2)>=0));
plot(t,y)
grid on
xlabel('t'),ylabel('y')
title('y = (1 + cos(pi * t)).* ((t>=0) - ((t-2)>=0))')
axis([-1 5 -0.5 2.5]);
2.
(1)
t = -4:0.01:10;
a = pi / 4;
b = pi / 2;
y = 2 + exp((a * i) * t) + exp((b * i) * t);
subplot(2,2,1);plot(t,real(y));title('实部');axis([-4 10 0 4.5]);grid on;
subplot(2,2,2);plot(t,imag(y));title('虚部');axis([-4 10 -3 4]);grid on;
subplot(2,2,3);plot(t,abs(y));title('模');axis([-4 10 0 4.5]);grid on;
subplot(2,2,4);plot(t,angle(y));title('相角');axis([-4 10 -1.5 1]);grid on;
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