Communication Matrix

[h1a8]

1. The problem statement, all variables and given/known data
Problem #10 here http://i54.tinypic.com/2mn2nwp.jpg


2. Relevant equations
What is the idea behind a communication matrix and how to indicate the arrows of transmission?


3. The attempt at a solution
I've been a math tutor/teaching for many years and have not come across this type of problem. I can't help several students with it simply because I don't know where to start. All I need is some basic idea of what is going on here and I should be fine.

[HallsofIvy]

The rows are labeled "from" and the columns are labeled "to". Also there are only "0"s and "1"s in the matrix. There is a transmission from "x" to "y" if and only if there is a "1" in "row x, column y" so you draw an arrow from "x" to "y" in that case.

Here, the "nodes" are A, B, and C so draw three points, labled "A", "B", and "C" and draw the arrows as I said above. For this particular problem you should have just two "doubleended" arrows.

[h1a8]

The rows are labeled "from" and the columns are labeled "to". Also there are only "0"s and "1"s in the matrix. There is a transmission from "x" to "y" if and only if there is a "1" in "row x, column y" so you draw an arrow from "x" to "y" in that case.

Here, the "nodes" are A, B, and C so draw three points, labled "A", "B", and "C" and draw the arrows as I said above. For this particular problem you should have just two "doubleended" arrows.

Thanks! I got it.