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N=128; % 采样点数 T=1; % 采样时间终点 t=linspace(0,T,N); % 给出N个采样时间ti(I=1:N) x=12*sin(2*pi*10*t+pi/4)+5*cos(2*pi*40*t); % 求各采样点样本值x dt

x=0:pi/100:2*pi; y1=2*exp(-0.5*x); y2=cos(4*pi*x); plot(x,y1,x,y2) title('x from 0 to 2{\pi}'); %加图形标题 xlabel('Variable X'); %加X轴说明 ylabel('Variable Y');

x=0:pi/10:2*pi; y=2*sin(x); subplot(2,2,1);bar(x,y,'g'); title('bar(x,y,''g'')');axis([0,7,-2,2]); subplot(2,2,2);stairs(x,y,'b'); title('stairs(x,y,''b'')');axis([0,7,-2,2]); subplot(2,2,3);ste

x=0:pi/50:2*pi; y=sin(x); z=cos(x); plot(x,y,'r',x,z,'g'); %绘制两根不同曲线 Hl=get(gca,'Children'); %获取两曲线句柄向量Hl for k=1:size(Hl) if get(Hl(k),'Color')==[0 1 0] %[0 1 0]代表

x=0:pi/100:2*pi; y1=0.2*exp(-0.5*x).*cos(4*pi*x); plot(x,y1) hold on y2=2*exp(-0.5*x).*cos(pi*x); plot(x,y2); hold off

DFT：离散傅立叶变换 MATLAB代码： clear; clc; N=12; % 数据长度 n=0:N-1; xn=sin(pi*n/6); % 以此序列为例，1/6是信号频率对1/2采样频率归一化的值 k=0:N-1; WN=exp(-j*2*pi/N); nk=n'*k; WNnk=WN.^nk; Xk=xn*WNnk; % DFT结果

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

%exa129_square.m for example 1-29 %square function方波函数 clear all; t=0:0.01:6*pi; x=square(t,30); plot(t,x) axis([0 6*pi -1 1.1])

%exa134_rectpuls.m for example 1-34 %rectpuls function rectpuls函数 clear all; fs=100;%sample frequency x=0:1/fs:pi; w=3; y=rectpuls(x,w); plot(x,y) axis([0 pi 0 1.1])