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xiangzigood

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[ÇóÖú] matlab fsolveµÃ³öµÄ½âÈ«²¿Îª¸´Êý½â

ÎÒÓÃmatlabÖеÄFSOLVE½âÒ»¸öÁùÔª·ÇÏßÐÔ·½³Ì×飬ΪʲôµÃ³öµÄ½âÈ«²¿Îª¸´Êý½â£¬¿ÉÊÇÀíÂÛÉÏÓ¦¸Ã½âΪʵÊý£¬±¾ÈËMatlabÐÂÊÖ£¬´úÂëÈçÏ£¬´óÉñÃǰïæ¿´Ò»Ï°ɣ¡
function[x,x0,fval,exitflag]=fsolveyalinjieliu
d=0.045;D=0.05;k=1.4;ff=0.004;L=100;P1=1500000;T1=300;Pa=101325;M=29;R=8.314;
x0=unifrnd(0,1,1,6);
options=optimset('MaxFunEvals',20000,'MaxIter',5000);
[x,fval,exitflag]=fsolve(@f,x0,options);
function F=f(x)
F=[((k+1)/2)*log((x(2)^2*x(3))/(x(1)^2*x(4)))-(1/(x(1)^2)-1/(x(2)^2))+4*ff*L/D;
   (d^2/D^2)*x(5)*sqrt((2*k*M)*((Pa/x(5))^(2/k)-(Pa/x(5))^((k+1)/k))/(R*x(6)*(k-1)))-x(2)*x(5)*sqrt((k*M)/(R*x(6)));
   (d^2/D^2)*x(5)*sqrt((2*k*M)*((Pa/x(5))^(2/k)-(Pa/x(5))^((k+1)/k))/(R*x(6)*(k-1)))-x(1)*P1*sqrt((k*M)/(R*T1));
   1+((k-1)*x(1)^2)/2-x(3);  
   1+((k-1)*x(2)^2)/2-x(4);  
    ]
end
end
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xiangzigood

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