matlab經(jīng)典的小程序

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; end fprintf(x=%f,y=%fn,x,y); end 2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-y

2、2).2); fprintf(the 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=0:0.01:5 3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 = polar

3、2rect(r, theta) x = r * cos(theta * 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 messag

4、e. if x = 0 & y = 0 msg = both x and y are zero: angle is meaningless!; warning(msg); end % now calculate the magnitude mag = sqrt(x .2 + y .2); % if the second output argument is present,calculate % angle in degrees if nargout = 2 angle = atan2(y,x) * 180/pi; end 6. 三維螺旋線t = 0:pi/50:10*pi; plot

5、3(sin(t),cos(t),t) grid on axis square 7.subplot figure(1); 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); 8figure figure(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 gain polar (theta,gain,r-); title (gain versus angle ittheta); 11. 色彩控制x=0:pi/15:4*pi; y=e