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1.Ê×ÏȽ¨Á¢º¯Êýmyfun,´¢´æ·½³Ì×é±à³ÌÈçϽ«myfun.m±£´æµ½¹¤×÷·¾¶ÖÐ: function F = myfun( x ) %this function designed for solving nonlinear equations a = x(1); b = x(2); c = x(3); d = x(4); e = x(5); f = x(6); F = [a+b*10+c*10^2+(d+e*10)/(0.6438^2-f^2)-2*1.620015/(1.620015^2-1)*(-0.87+2.6); a+b*10+c*10^2+(d+e*10)/(0.6328^2-f^2)-2*1.620507/(1.620507^2-1)*(-0.87+2.7); a+b*10+c*10^2+(d+e*10)/(0.5893^2-f^2)-2*1.622702/(1.622702^2-1)*(-0.87+2.8); a+b*10+c*10^2+(d+e*10)/(0.5461^2-f^2)-2*1.625401/(1.625401^2-1)*(-0.87+2.9); a+b*10+c*10^2+(d+e*10)/(0.4800^2-f^2)-2*1.631029/(1.631029^2-1)*(-0.88+3.3); a+b*10+c*10^2+(d+e*10)/(0.4358^2-f^2)-2*1.636369/(1.636369^2-1)*(-0.88+3.6)]; end 2.ÔËÐгÌÐò x0=[-3e-005,-1.5e-008,-5.0e-011,3.0e-007,2.0e-010,0]; options=optimset('Display','iter','TolFun',1e-020,'TolX',1e-020,'MaxIter',1e100); format long; [x,fval]=fsolve(@myfun,x0,options) ÔËÐнá¹ûÏÔʾÈçÏ£º Norm of First-order Trust-region Iteration Func-count f(x) step optimality radius 0 7 106.837 2.5e+003 1 1 14 1.58981 0.0393664 28.2 1 2 21 0.0425606 0.0513838 36.8 1 3 28 0.0198142 0.000578732 0.414 1 4 35 0.0194798 0.000755402 0.541 1 5 42 0.0194749 8.50804e-006 0.00609 1 6 49 0.0194748 1.11053e-005 0.00795 1 7 56 0.0194748 1.25077e-007 8.95e-005 1 8 63 0.0194748 1.6325e-007 0.000117 1 9 70 0.0194748 1.84156e-009 1.32e-006 1 10 77 0.0194748 2.41651e-009 1.58e-006 1 11 84 0.0194748 2.49273e-011 1.22e-008 1 Optimizer appears to be converging to a point which is not a root. Relative function value changing by less than max(options.TolFun^2,eps) but sum-of-squares of function values is greater than or equal to sqrt(options.TolFun) Try again with a new starting guess. x = 0.000167225746880 0.001972242468804 0.019722574638040 0.006232656757062 0.062323567700574 0.000000000137224 fval = 0.060290300323624 -0.083434220551602 -0.030535103096213 0.083729176350573 -0.030583681232919 0.000533528265654 ×¢£ºº¯Êý¾«¶ÈԶԶСÓÚÉ趨¾«¶ÈÖµ£»²ÎÊýÖµÓ¦½Ó½üÓÚÉ趨ֵ£¬µ«Ïà²îºÜÔ¶¡£ |
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zidingxiang
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