Solve Nonlinear System of Equations

  • Thread starter phil0stine
  • Start date
Hi, I have a set of vectors that I would like to solve for in a nonlinear system of equations.

I have tried to use scipy.fsolve to solve the system, but without success. I believe the problem is that scipy expects the same number of inputs as outputs. I have a 12x1 input vector, but I can only generate 9 independent equations.

I would appreciate any help with this, for example how I could over-constrain the problem, or am I missing something?

The vectors {C,R1,R2,R3} are all (3x1). There are also a set of (3x1) vectors {S1,S2,S3} that are known.

The equations are as follows:

CTR1=S1 (1)

CTR2=S2 (2)

CTR3=S3 (3)

and finally

[R1 R2 R3]T[R1 R2 R3]=I

which can be reduced to

R1TR1=R2TR2=R3TR3=1 (4,5,6)

R1TR2=R2TR3=R3TR1=0 (7,8,9)

R2TR1=R3TR2=R1TR3=0 Would give me 12 equations, but they are exactly the same as Equations 7,8,9.

So I dont know how to proceed. I would appreciate if anybody could point me in a direction, or to a matlab/scipy routine.
I think I have it, I cannot solve the system without an additional set of constraints.

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads