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[求助]
怎樣在fsolve中對初值進行循環(huán)并縮短運行時間？
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本人在解四個非線性方程，每一個非線性方程需要給定對應初值才能解，本人給初值寫了四個循環(huán)，分別對應的是t0i,t1i0,t2i0,t3i0。要求是當非線性方程解出的結(jié)果滿足一定條件時則這組初值可選，問題在于四個for循環(huán)計算時間很長，請問大家有何方法可以改進？我用了fsolve解初值，把初值設置成了變量。以下為可運行程序，但是運行時間很長。 % Find the initial condition clc clear tic global t1i C1 C2 a d d1 d2 omega w yi t0i t2i t3i t4i t1i0 t2i0 t3i0 t4i0 j d3 d4 C3 C4 a=20; c=100; d=0.5; w=sqrt(c-d^2); j=0; m=0; n=1; A=zeros(10,n); omega=4.8; T=2*pi/omega; t4i0=t0i+T; d1=(c-omega^2)/((c-omega^2)^2+(2*d*omega)^2); d2=(2*d*omega)/((c-omega^2)^2+(2*d*omega)^2); d3=(-1)/(omega^2+4*d^2); d4=(2*d)/((omega)*(omega^2+4*d^2)); % 以下為循環(huán) for yi=5:0.1:13 for t0i=0  (2*pi/omega)/500)2*pi/omega)for t1i0=(1/5)*T+t0i:1 1/4)*T+t0ifor t2i0=(2/5)*T+t0i:1 1/2)*T+t0ifor t3i0=(3/5)*T+t0i:1 4/5)*T+t0iC1=-a*(d1*cos(omega*t0i)+d2*sin(omega*t0i)); C2=(1/w)*(yi-a*((d2*d-d1*omega)*sin(omega*t0i)+(d1*d+d2*omega)*cos(omega*t0i))); t1i=fsolve(@(t1i) (C1*cos(w*(t1i-t0i))+C2*sin(w*(t1i-t0i)))*exp(-d*(t1i-t0i))+a*(d1*cos(omega*t1i)+d2*sin(omega*t1i)),t1i0); x2=((C2*w-C1*d)*cos(w*(t1i-t0i))-(C1*w+C2*d)*sin(w*(t1i-t0i)))*exp((-d)*(t1i-t0i))-a*omega*(d1*sin(omega*t1i)-d2*cos(omega*t1i)); C3=(1/(-2*d))*(x2+(a*omega)*(d3*sin(omega*t1i)-d4*cos(omega*t1i))); C4=(1/(2*d))*(x2+2*d*1-(a/omega)*sin(omega*t1i)); t2i=fsolve(@(t2i) C3*exp(-2*d*(t2i-t1i))+C4+a*(d3*cos(omega*t2i)+d4*sin(omega*t2i))+1,t2i0); x4=-2*d*C3*exp(-2*d*(t2i-t1i))-a*omega*(d3*sin(omega*t2i)-d4*cos(omega*t2i)); C1=-a*(d1*cos(omega*t2i)+d2*sin(omega*t2i)); C2=(1/w)*(x4-a*((d2*d-d1*omega)*sin(omega*t2i)+(d1*d+d2*omega)*cos(omega*t2i))); t3i=fsolve(@(t3i) (C1*cos(w*(t3i-t2i))+C2*sin(w*(t3i-t2i)))*exp(-d*(t3i-t2i))+a*(d1*cos(omega*t3i)+d2*sin(omega*t3i)),t3i0); x6=((C2*w-C1*d)*cos(w*(t3i-t2i))-(C1*w+C2*d)*sin(w*(t3i-t2i)))*exp((-d)*(t3i-t2i))-a*omega*(d1*sin(omega*t3i)-d2*cos(omega*t3i)); C3=(1/(-2*d))*(x6+(a*omega)*(d3*sin(omega*t3i)-d4*cos(omega*t3i))); C4=(1/(2*d))*(x6-2*d-(a/omega)*sin(omega*t3i)); t4i=fsolve(@(t4i) C3*exp(-2*d*(t4i-t3i))+C4+a*(d3*cos(omega*t4i)+d4*sin(omega*t4i))-1,t0i+T); x8=-2*d*C3*exp(-2*d*(t4i-t3i))-a*omega*(d3*sin(omega*t4i)-d4*cos(omega*t4i)); %選初值的條件 if abs(t4i-T-t0i)<0.1 && abs(x8-yi)<0.1 && t4i>t3i && t3i>t2i && t2i>t1i && x2<0 && x4<0 && x6>0 && x8>0 figure(1) hold on axis([0 8 0 20]) plot(omega,yi,'o') A(:,n)=[t0i;yi;t1i;x2;t2i;x4;t3i;x6;t4i;x8]; n=n+1; end j=j+1; j end end end end end toc load chirp sound(y,Fs) |
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