- #1
Tamis
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Homework Statement
Subpart of the question requires me to find the steady state of the transition matrix:
[itex]P=\begin{bmatrix}
0.1 & 0.7 & 0.2 \\
0.1 & 0.8 & 0.1\\
0.3 & 0.1 & 0.6
\end{bmatrix}[/itex]
Homework Equations
We thus need to find vector [itex]\boldsymbol{v}[/itex] in the equation [itex]P\boldsymbol{v}=\boldsymbol{v}[/itex] under the constraint [itex]sum(\boldsymbol{v})=1[/itex].
The Attempt at a Solution
Basically a system of linear equations with the added constraint:
[itex]\begin{matrix}
-0.9x_1 &+& 0.7x_2 &+& 0.2x_3 & = 0 \\
0.1x_1 &+& -0.2x_2 &+& 0.1x_3 & = 0 \\
0.3x_1 &+& 0.1x_2 &+& -0.4x_3 & = 0 \\
x_1 &+& x_2 &+& x_3 & = 1
\end{matrix}[/itex]
I put this in matrix form:
[itex]\begin{bmatrix}
-0.9 & 0.7 & 0.2 & | 0\\
0.1 & -0.2 & 0.1 & | 0\\
0.3 & 0.1 & -0.4 & | 0\\
1 & 1 & 1 & | 1
\end{bmatrix}[/itex]
and solve:
[itex]\begin{bmatrix}
1 & 0 & 0 & | \frac{1}{3}\\
0 & 1 & 0 & | \frac{1}{3}\\
0 & 0 & 0 & | 0\\
0 & 0 & 1 & | \frac{1}{3}
\end{bmatrix}[/itex]
However this is wrong as the answer states:
[itex]\boldsymbol{v}=\begin{bmatrix}
0.1+0.2\frac{3}{16} \\
0.9-1.2\frac{3}{16} \\
\frac{3}{16} \\
\end{bmatrix}[/itex]
Can anyone tell me were i am going wrong? Not entirely sure how to find the steady state of a markov chain. The only examples i can find are examples of steady states in 2x2 transition matrices.