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n=-5:10; x=sin(pi*n/2); k=-100:100;w=pi/100*k; X=x*(exp(-j*pi/100)).^(n'*k); [xe,xo,m]=evenodd(x,n); XE=xe*(exp(-j*pi/100)).^(m'*k); XO=xo*(exp(-j*pi/100)).^(m'*k); XR=real(X); error1=max(abs(

x=linspace(0,2*pi,30); y=sin(x); z=cos(x); plot(x,y,'--',x,z,':'); grid xlabel('x') ylabel('y') title('正弦及余弦曲线')

n=[-5:5]; x=(-0.9).^n; k=-200:200;w=(pi/100)*k; X=x*exp(-j*pi/100.*(n'*k)); magX=abs(X);angX=angle(X); subplot(2,1,1);plot(w/pi,magX);grid; xlabel('Frequency');ylabel('amplitude'); subplot(2,1,

x1=rand(1,11);x2=rand(1,11);n=0:10; alpha=2;beta=3; k=0:500; w=(pi/500)*k; X1=x1*(exp(-j*pi/500)).^(n'*k); X2=x2*(exp(-j*pi/500)).^(n'*k); x=alpha*x1+beta*x2; X=x*(exp(-j*pi/500)).^(n'*k); erro

n=[-5:5]; x=(-0.9).^n; k=-200:200;w=(pi/100)*k; X=x*exp(-j*pi/100.*(n'*k)); magX=abs(X);angX=angle(X); subplot(2,1,1);plot(w/pi,magX);grid; xlabel('Frequency');ylabel('amplitude'); subplot(2,1,

n=[0:1:99];x=cos(0.48*pi*n)+cos(0.52*pi*n); subplot(2,1,1);stem(n,x);title('signal 0

n=[0:10]; x=(0.9*exp(j*pi/3)).^n; k=-200:200;w=(pi/100)*k; X=x*exp(-j*pi/100.*(n'*k)); magX=abs(X);angX=angle(X); subplot(2,1,1);plot(w/pi,magX);grid; xlabel('Frequency');ylabel('amplitude'); s

n=[0:1:99];x=cos(0.48*pi*n)+cos(0.52*pi*n); n1=[0:1:9];x1=x(1:1:10); subplot(2,2,1);stem(n1,x1);title('signal 0

w=[0:1:500]*pi/500; X=exp(j*w)./(exp(j*w)-0.5*ones(1,501)); magX=abs(X);angX=angle(X); realX=real(X);imagX=imag(X); subplot(2,2,1);plot(w/pi,magX);grid; xlabel('frequency');ylabel('amplitude');ti

Wp=0.2*pi;Ws=0.3*pi;Rp=7;As=16; Ripple=10^(-Rp/20);Attn=10^(-As/20); % Analog filter design; [b,a]=afd_butt(Wp,Ws,Rp,As) %***Butterworth Filter Order=3 %Calculation of second-order sections: [C,