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#1 2011-03-30 09:18:36

gftrigo
Member
Registered: 2011-03-17
Posts: 7

Algebra problem!

Hi!

I have this algebra problem that has been puzzling me.

I have this matrix multiplication:

where A and theta are a 3x3 matrix and a 3x1 vector, respectively, both dependent of x and D and S are 3x3 constant matrices.
A is a symmetric matrix, D is a diagonal matrix and S is a skew-symmetric matrix.
I need to arrange this into the form:

where C is a constant matrix and F(x) is a vector function of x. The dimensions of these matrix and vector are not important, as long as the result of the multiplication is 3x1.
I need to isolate the x dependent part on the right side of the term in order to apply a control algorithm.

Does anyone know how to do this?

Thanks!

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#2 2011-03-31 18:51:35

Dragonshade
Member
Registered: 2008-01-16
Posts: 147

Re: Algebra problem!

never mind. I got it wrong : (

Last edited by Dragonshade (2011-03-31 20:13:41)

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#3 2011-04-05 10:54:57

2luv4everel@gmail.com
Member
Registered: 2011-04-05
Posts: 1

Re: Algebra problem!

2y - y - =15
x+2y=45

help me

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#4 2011-04-05 10:58:46

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Algebra problem!

Hi 2luv4everel@gmail.com;

Welcome to the forum!

Now substitute into the second equation.

Subtract 30 from both sides.

So x = 15 and y = 15


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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