Matrix M Formulation for Xn and Xn+1

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Discussion Overview

The discussion revolves around formulating a matrix M that relates two vectors Xn and Xn+1 in a system where the components represent concentrations of reactants A and B over time steps. The context includes determining the precise form of the matrix based on given transformation percentages of the reactants.

Discussion Character

  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • Post 1 introduces the need to find the matrix M that relates Xn and Xn+1.
  • Post 2 emphasizes the necessity for additional information regarding the definitions of An and Bn to formulate M.
  • Post 3 clarifies that An and Bn are numbers representing concentrations, and provides specific transformation percentages: 80% of A transforms into B and 60% of B transforms into A.
  • Post 4 derives the equations An+1 = 0.2An + 0.6Bn and Bn+1 = 0.8An + 0.4Bn, proposing the matrix M as [0.2 0.6; 0.8 0.4].

Areas of Agreement / Disagreement

Participants appear to agree on the transformation percentages and the resulting equations for An+1 and Bn+1, but there is no explicit consensus on the overall formulation of M beyond the proposed matrix in Post 4.

Contextual Notes

The discussion relies on specific assumptions about the transformation rates and the definitions of the components An and Bn, which may not be universally applicable without further context.

n0_3sc
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I need help finding the form of the matrix M, here's the question:
(n and n+1 is a subscript):

Xn =
[An]
[Bn]

Xn+1 = MXn

M is a 2 x 2 matrix. The question says - What is the precise form of the matrix M?
 
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You are going to need more information than that! For one thing, are An and Bn numbers? The real information you need is some definition of xn. Just "xn+1= Mxn isn't enough. Do you have formulas for An and Bn?
 
o sorry, the other information given is that the vectors with two components are A, & B so yes they are numbers. (which represents the concentration of a reactant-for the question).
After one time step (where n represents the timesteps thus n+1) 80% of A is transformed into B while 60% of B is tranformed into A.

Does this help?
 
So An+1= 0.2An+ 0.6Bn (the 20% of A left over after 80% is transformed into B and the 60% of B that is transformed into A) and
Bn+1= 0.8An+ 0.4Bn.

Looks like M=
[0.2 0.6]
[0.8 0.4]
 
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