Matrix equation

  • Thread starter andybham
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  • #1
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Is it possible to put these three equations into a matrix equation

w*a = b -2a + e
w*b = c -2b + a
w*c = d -2c + b

of the style w*u = T*u where u is a vector, u = {a, b, c} and T is a matrix. w is just a number.
 

Answers and Replies

  • #2
mathman
Science Advisor
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What are d and e? If they are really different and not typos, then you will need T*u+v=w*u, where v is the vector (e,0,d) and ------------------------------------------------
------------------------------------------------------------------
T=
-2 1 0
1 -2 1
0 1 -2
--------------------------------------------------------------------------------
 
Last edited:
  • #3
15
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no they are not typos, could I not use

T = -2 1 e/c
1 -2 1
d/a 1 -2

or is that just stupid?
 
  • #4
radou
Homework Helper
3,115
6
Is it possible to put these three equations into a matrix equation

w*a = b -2a + e
w*b = c -2b + a
w*c = d -2c + b

of the style w*u = T*u where u is a vector, u = {a, b, c} and T is a matrix. w is just a number.
What exactly are the unknowns in your equations? a, b, c? If so, then

(2 + w)a - b = e
-a + (2 + w)b - c = 0
-b + (2 + w)c = d ,

which can be written as
[tex]\left(\begin{array}{ccc}2+w & -1 & 0\\-1 & 2+w & -1\\0 & -1 & 2+w\end{array}\right) \left(\begin{array}{ccc}a \\b\\c\end{array}\right)=\left(\begin{array}{ccc}e \\0\\d\end{array}\right)[/tex].
 

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