matlab经典的小程序

1、Num2str变数值为字符串Int2str变整数为字符串Str2num变字符串为数值Sprintf变数值为格式控制下的字符串Sscanf变字符串为格式控制下的数值.分段函数for x=-pi*6:pi/10:6*pi y=sin(x);if y0y=0;endfprintf(x=%f,y=%fn,x,y);end.计算距离x1=input(enter the x1:);y1=input(enter the y1:);x2=input(enter the x2:);y2=input(enter the y2:);d=sqrt(x1-x2)A2+(y1-y2)A2);fprintf(the dis

2、tance of the two points is :%f,d);v0=input(Enter the初速度 v0:);h0=input(Enter the离地高度 h0:);t=0:0.01:5.重力加速度h=-0.5*9.81*t.A2+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);.坐标转换function x, y = polar2rect(r, theta)x = r * cos(theta * p

3、i/180);y = r * sin(theta * pi/180);坐标转换，带参数检验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 2y = 0;end% Check for (0,0) input argument, and print out% a warning message.if x = 0 & y = 0msg = Both x and y are zero: ang

4、le is meaningless!; warning(msg);end% Now calculate the magnitudemag = sqrt(x .A2 + y .A2);% If the second output argument is present,calculate% angle in degreesif nargout = 2angle = atan2(y,x) * 180/pi;end三维螺旋线t = 0:pi/50:10*pi;plot3(sin(t),cos(t),t)grid onaxis square7.subplotfigure(1);subplot(2,1,

5、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); Figurefigure(1);x=x:0.05:2;y1=exp(x);plot(x,y1);figure(2);y2=exp(-x);plot(x,y2);. 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);. 极坐标绘图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);.色彩控制x=0:pi/15:4*pi;y=exp(2