help me solve a problem please.

2011 6 30
2 个回答
3 次查看（30 天）

0 个投票

Hi I am new to matlab and need help in solving problem. Thre is a set of three non-linear equations and i used fsolve lsqnonlin but i am getting complex values. the solution should be real only.
A=9.276573254453513e+07
B=2.217725354910644e+09
C=9.438300268833828e+04
q=2.774309890414760e-05
A*x^1.75+B*x^2=C*(q-x)^1.75+A*y^1.75+B*y^2
A*y^1.75+B*y^2=C*(q-x-y)^1.75+A*z^1.75+B*z^2
x+y+z=q
initial guess- x=y=z=q/3
Please help. Solution is real only.

请先登录，再回答此问题。

回答（2 个）

Walter Roberson
Walter Roberson 2011-6-30

0 个投票

Because your ^1.75 is not an integer power, if one of the expressions being raised to that ^1.75 goes negative, the power will be evaluated using complex logs.
Sorry, I am out of time to follow this further.
Saravanan Mani
Saravanan Mani 2011-6-30

0 个投票

This equation is correct. I attach the file your mail id see there. Let know if any concern
Thanks, Saravanan Mani

类别

在 帮助中心 和 File Exchange 中查找有关 Mathematics 的更多信息

产品

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by