matlab經(jīng)典的小程序3頁(yè)

1、Num2str變數(shù)值為字符串Int2str變整數(shù)為字符串Str2num變字符串為數(shù)值Sprintf變數(shù)值為格式控制下的字符串Sscanf變字符串為格式控制下的數(shù)值1.分段函數(shù)for x=-pi*6:pi/10:6*pi y=sin(x);if y0 y=0;endfprintf(x=%f,y=%fn,x,y);end2計(jì)算距離x1=input(enter the x1: );y1=input(enter the y1: );x2=input(enter the x2: );y2=input(enter the y2: );d=sqrt(x1-x2).2+(y1-y2).2);fprintf(t

2、he distance of the two points is :%f,d);v0=input(Enter the 初速度v0:);h0=input(Enter the 離地高度h0:);t=0:0.01:53重力加速度h=-0.5*9.81*t.2+v0*t+h0;v=-9.81*t+v0;plot(t,h,k-,t,v,b-);title( Plot of h(t) and v(t); xlabel(t); ylabel(h(t)andv(t);legend(h(t),v(t);4.坐標(biāo)轉(zhuǎn)換function x, y = polar2rect(r, theta)x = r * cos(t

3、heta * pi/180);y = r * sin(theta * pi/180);5.坐標(biāo)轉(zhuǎn)換，帶參數(shù)檢驗(yàn)function mag, angle = polar_value(x, y)msg = nargchk(1,2,nargin);error(msg);% If the y argument is missing, set it to 0.if nargin 2 y = 0;end% Check for (0,0) input argument, and print out% a warning message.if x = 0 & y = 0 msg = Both x and y a

4、re zero: angle is meaningless!; warning(msg);end% Now calculate the magnitudemag = sqrt(x .2 + y .2);% If the second output argument is present,calculate% angle in degreesif nargout = 2 angle = atan2(y,x) * 180/pi;end6.三維螺旋線t = 0:pi/50:10*pi;plot3(sin(t),cos(t),t)grid onaxis square7.subplotfigure(1)

5、;subplot(2,1,1);x=-pi:pi/20:pi;y=sin(x);plot(x,y);title(Subplot 1 title);subplot(2,1,2);x=-pi:pi/20:pi;y=cos(x);plot(x,y);title(Subplot 2 title);8Figurefigure(1);x=x:0.05:2;y1=exp(x);plot(x,y1);figure(2);y2=exp(-x);plot(x,y2);9.保持x=-pi:pi/20:pi;y1=sin(x);y2=cos(x);plot(x,y1,b-);hold on;plot(x,y2,k-);hold off;legend (sin x,cos x);10.極坐標(biāo)繪圖g = 0.5;theta = 0:pi/20:2*pi;gain = 2*g*(1+cos(theta);% Plot gainpolar (theta,gain,r-);title (Gain versus angle ittheta);11.色彩控制x=0:pi/15:4*pi;y=exp(