inequality solution

[Narges]

Hi everybody. I want to find suitable range for four parameters: x(1), x(2), x(3) and x(4); in a way that:

 

326.705<x(1)*x(2)*(1+x(4))^2*(1-x(4))*x(3)^3<378.29

 

What should i do?

Is there any way to find the answer by MATLAB?

[studiot]

Have I got this right?

 

I have transposed you formula using A,B,C,D for the parameters

 

326.705 < ABC³(1-D)(1+D)² < 378.29

 

You can use the superscript icon for the powers

 

Since you have a (1-D) can the parameters take on negative values (do you understand why I am asking this)?

Edited September 9, 2013 by studiot

[Narges]

I know that non of the parameters are negative and D is less than 1. you got the formula right.

 

p.s. this is part of an optimization problem for a generator design, so I know the amount of parameters approximately but I need to know in which range I could change them to earn optimize result.

[mathematic]

You have too much freedom as the problem is stated. For example x(2) = 1/x(1) allows x(1) to be anything (except 0).