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urion铁杆木虫 (职业作家)
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[交流]
【求助】matlab逆求解方程问题
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function fc syms r t a b p1 v; y=r*t/(v-b)-a*t/(v*(v+b)+b*(v-b))-p1 v=solve(y,'v') 即可解出变量v的值, 现在y是知道的如果求解出v的值? 谁能给出正确的结果,送5个金币表示感谢! [ Last edited by urion on 2009-12-9 at 00:10 ] |
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change0618
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5楼2009-12-08 23:32:24
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6楼2009-12-09 20:03:00
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偶很差，试试吧
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小木虫(金币+0.5):给个红包，谢谢回帖交流
小木虫(金币+0.5):给个红包，谢谢回帖交流
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>> syms r t a b p1 v y; f = r*t/(v-b)-a*t/(v*(v+b)+b*(v-b))-p1-y; v = solve(f,v) v = 1/6/(p1+y)*(-672*p1^2*b^3*y-672*p1*b^3*y^2-48*r*t*b^2*p1^2-48*r*t*b^2*y^2+144*a*t*p1^2*b+144*a*t*y^2*b+48*r^2*t^2*b*p1+48*r^2*t^2*b*y-36*a*t^2*r*p1-36*a*t^2*r*y-224*p1^3*b^3-224*y^3*b^3-96*r*t*b^2*p1*y+288*a*t*p1*b*y+8*r^3*t^3+12*3^(1/2)*(4*y*a^3*t^3-192*y^2*p1^2*b^6-128*y^3*p1*b^6-8*r^4*t^4*b^2+4*a^3*t^3*p1-a^2*t^4*r^2-32*p1^4*b^6-128*r*t*b^5*p1^3-64*r^3*t^3*b^3*p1-160*r^2*t^2*b^4*p1^2+8*r^3*t^4*b*a-16*a*t*p1^3*b^4+8*a^2*t^2*p1^2*b^2-40*r*t^3*b*p1*a^2+88*r^2*t^3*b^2*p1*a+112*r*t^2*b^3*p1^2*a-128*y^3*r*t*b^5-16*y^3*a*t*b^4-160*y^2*r^2*t^2*b^4+8*y^2*a^2*t^2*b^2-64*y*r^3*t^3*b^3-128*y*p1^3*b^6-32*b^6*y^4+112*y^2*r*t^2*b^3*a-48*y^2*a*t*p1*b^4-384*y^2*r*t*b^5*p1+88*y*r^2*t^3*b^2*a-40*y*r*t^3*b*a^2-384*y*r*t*b^5*p1^2+16*y*a^2*t^2*p1*b^2+224*y*r*t^2*b^3*p1*a-48*y*a*t*p1^2*b^4-320*y*r^2*t^2*b^4*p1)^(1/2)*p1+12*3^(1/2)*(4*y*a^3*t^3-192*y^2*p1^2*b^6-128*y^3*p1*b^6-8*r^4*t^4*b^2+4*a^3*t^3*p1-a^2*t^4*r^2-32*p1^4*b^6-128*r*t*b^5*p1^3-64*r^3*t^3*b^3*p1-160*r^2*t^2*b^4*p1^2+8*r^3*t^4*b*a-16*a*t*p1^3*b^4+8*a^2*t^2*p1^2*b^2-40*r*t^3*b*p1*a^2+88*r^2*t^3*b^2*p1*a+112*r*t^2*b^3*p1^2*a-128*y^3*r*t*b^5-16*y^3*a*t*b^4-160*y^2*r^2*t^2*b^4+8*y^2*a^2*t^2*b^2-64*y*r^3*t^3*b^3-128*y*p1^3*b^6-32*b^6*y^4+112*y^2*r*t^2*b^3*a-48*y^2*a*t*p1*b^4-384*y^2*r*t*b^5*p1+88*y*r^2*t^3*b^2*a-40*y*r*t^3*b*a^2-384*y*r*t*b^5*p1^2+16*y*a^2*t^2*p1*b^2+224*y*r*t^2*b^3*p1*a-48*y*a*t*p1^2*b^4-320*y*r^2*t^2*b^4*p1)^(1/2)*y)^(1/3)-2/3*(-4*r*t*b*p1-4*r*t*b*y+3*a*t*p1+3*a*t*y-10*p1^2*b^2-20*p1*b^2*y-10*y^2*b^2-r^2*t^2)/(p1+y)/(-672*p1^2*b^3*y-672*p1*b^3*y^2-48*r*t*b^2*p1^2-48*r*t*b^2*y^2+144*a*t*p1^2*b+144*a*t*y^2*b+48*r^2*t^2*b*p1+48*r^2*t^2*b*y-36*a*t^2*r*p1-36*a*t^2*r*y-224*p1^3*b^3-224*y^3*b^3-96*r*t*b^2*p1*y+288*a*t*p1*b*y+8*r^3*t^3+12*3^(1/2)*(4*y*a^3*t^3-192*y^2*p1^2*b^6-128*y^3*p1*b^6-8*r^4*t^4*b^2+4*a^3*t^3*p1-a^2*t^4*r^2-32*p1^4*b^6-128*r*t*b^5*p1^3-64*r^3*t^3*b^3*p1-160*r^2*t^2*b^4*p1^2+8*r^3*t^4*b*a-16*a*t*p1^3*b^4+8*a^2*t^2*p1^2*b^2-40*r*t^3*b*p1*a^2+88*r^2*t^3*b^2*p1*a+112*r*t^2*b^3*p1^2*a-128*y^3*r*t*b^5-16*y^3*a*t*b^4-160*y^2*r^2*t^2*b^4+8*y^2*a^2*t^2*b^2-64*y*r^3*t^3*b^3-128*y*p1^3*b^6-32*b^6*y^4+112*y^2*r*t^2*b^3*a-48*y^2*a*t*p1*b^4-384*y^2*r*t*b^5*p1+88*y*r^2*t^3*b^2*a-40*y*r*t^3*b*a^2-384*y*r*t*b^5*p1^2+16*y*a^2*t^2*p1*b^2+224*y*r*t^2*b^3*p1*a-48*y*a*t*p1^2*b^4-320*y*r^2*t^2*b^4*p1)^(1/2)*p1+12*3^(1/2)*(4*y*a^3*t^3-192*y^2*p1^2*b^6-128*y^3*p1*b^6-8*r^4*t^4*b^2+4*a^3*t^3*p1-a^2*t^4*r^2-32*p1^4*b^6-128*r*t*b^5*p1^3-64*r^3*t^3*b^3*p1-160*r^2*t^2*b^4*p1^2+8*r^3*t^4*b*a-16*a*t*p1^3*b^4+8*a^2*t^2*p1^2*b^2-40*r*t^3*b*p1*a^2+88*r^2*t^3*b^2*p1*a+112*r*t^2*b^3*p1^2*a-128*y^3*r*t*b^5-16*y^3*a*t*b^4-160*y^2*r^2*t^2*b^4+8*y^2*a^2*t^2*b^2-64*y*r^3*t^3*b^3-128*y*p1^3*b^6-32*b^6*y^4+112*y^2*r*t^2*b^3*a-48*y^2*a*t*p1*b^4-384*y^2*r*t*b^5*p1+88*y*r^2*t^3*b^2*a-40*y*r*t^3*b*a^2-384*y*r*t*b^5*p1^2+16*y*a^2*t^2*p1*b^2+224*y*r*t^2*b^3*p1*a-48*y*a*t*p1^2*b^4-320*y*r^2*t^2*b^4*p1)^(1/2)*y)^(1/3)-1/3*(-r*t+p1*b+y*b)/(p1+y) 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[ Last edited by nono2009 on 2009-12-9 at 20:16 ] |
7楼2009-12-09 20:13:35
urion
铁杆木虫 (职业作家)
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8楼2009-12-09 20:57:55
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