⑴ matlab奼傚井鍒
瑙:涓懼嚑涓瑙寰鍒嗘柟紼鐨勪緥瀛
甯屾湜鍙浠ュ府鍒頒綘
⑵ 濡備綍奼傝В寰鍒嗘柟紼嬬粍
鐢ㄥ懡浠わ細dsolve('S','s1','s2',鈥,'x')
鍏朵腑S 涓烘柟紼媠1,s1,s3,鈥︿負鍒濆嬫潯浠秞 涓鴻嚜鍙橀噺鏂圭▼S 涓鐢― 琛ㄧず奼傚
鏁癉2,D3,鈥﹁〃紺轟簩闃朵笁闃剁瓑楂橀樁瀵兼暟鍒濆嬫潯浠剁己鐪佹椂緇欏嚭甯︿換鎰忓父鏁
C1,C2,..鐨勯氳В鑷鍙橀噺緙虹渷鍊間負t 涔熷彲奼傝В寰鍒嗘柟紼嬬粍
渚
1銆乨solve('Dy=1+y^2')
緇撴灉ans =tan(t+C1)
2銆亂=dsolve('Dy=1+y^2','y(0)=1','x')
緇撴灉y =tan(x+1/4*pi)
3銆亁=dsolve('D2x+2*D1x+2*x=exp(t)','x(0)=1','Dx(0)=0')
緇撴灉x =1/5*exp(t)+3/5*exp(-t)*sin(t)+4/5*exp(-t)*cos(t)
4銆丼=dsolve('Df=3*f+4*g','Dg=-4*f+3*g') %瑙e井鍒嗘柟紼嬬粍
S =
f: [1x1 sym]
g: [1x1 sym]
璁$畻緇撴灉榪斿洖鍦ㄤ竴涓緇撴瀯 S 涓涓轟簡鐪嬪埌鍏朵腑 f,g 鐨勫兼湁濡備笅鎸囦護
f=S.f
g=S.g
f =exp(3*t)*(cos(4*t)*C1+sin(4*t)*C2)
g =-exp(3*t)*(sin(4*t)*C1-cos(4*t)*C2)