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　　例9.1 #define PI　3.1415926 　　 main() 　　 ｛float l，s，r，v; 　　 printf("input raDiuS∶"); 　　 scanf("%f"，&r); 　　 l=2.0*PI*r; 　　 s=PI*r*r; 　　 v=3.0/4*PI*r*r*r; 　　 printf

function shili05 h0=figure('toolbar','none',... 'position',[200 150 450 250],... 'name','实例05'); t=0:pi/10:2*pi; [x,y]=meshgrid(t); subplot(2,2,1) plot(sin(t),cos(t)) axis equal sub

function shili06 h0=figure('toolbar','none',... 'position',[200 150 450 400],... 'name','实例06'); t=0:pi/10:2*pi; h=plot(t,sin(t)); xlabel('t=0到2\pi','fontsize',16); ylabel('sin(t)','fon

function shili05 h0=figure('toolbar','none',... 'position',[200 150 450 250],... 'name','实例05'); t=0:pi/10:2*pi; [x,y]=meshgrid(t); subplot(2,2,1) plot(sin(t),cos(t)) axis equal sub

function shili06 h0=figure('toolbar','none',... 'position',[200 150 450 400],... 'name','实例06'); t=0:pi/10:2*pi; h=plot(t,sin(t)); xlabel('t=0到2\pi','fontsize',16); ylabel('sin(t)','fon

clear all; close all; clf; fsa=3;fpa=4;fpb=6;fsb=8;Apass=0.1;Astop=80; fs=20; %kHz% wa=pi*(fsa+fpa)/fs; wb=pi*(fsb+fpb)/fs; %%%%%%% 所需带通滤波器的频率相应 D(w) %%%%%%%%%%% w=[-pi,-wb,-wb,-wa,-wa,wa,wa

% % t = 0:1024; % % x = exp(-t/256).*cos(pi/64*(t.^2/512+32)+0.3*sin(pi/32*(t.^2/512+32))); % % xn = cos(pi/64*(t.^2/512+32)+0.3*sin(pi/32*(t.^2/512+32))); % % am = exp(-t/256); % % % % %% Inst

nfft = 1024; fs = 1000; t = 0:1/fs:1; xn = sin(2*pi*100*t)+sin(2*pi*300*t)+sin(2*pi*450*t)+randn(size(t)); [P, f] = pburg(xn, 18, nfft, fs); Pxx = 10 * log10(P); figure plot(f, Pxx); grid on;

randn('state', 1); n = 0:99; s = sin(pi/3*n) + 2*sin(pi/4*n) + randn(1, 100); X = corrmtx(s, 7, 'mod'); % 使用改进的协方差法估计互相关矩阵 [s, w, V, E] = peig(X, 4, 'whole'); peig(X, 4, 'whole');

Fs = 1000; % 采样频率 NFFT = 256; t = 0:1/Fs:1; 　% 采样时间 x = sin(2*pi*100*t) + sin(2*pi*200*t) + sin(2*pi*400*t) + randn(size(t)); w = hanning(NFFT)'; % 256个点的海宁窗，注意取转置 Pxx = (abs(fft(w.*x(1:NFFT