Solve the system of equations



GIVEN

A system of three equations

FIND

(a) The solution of the system of equation using Jacobi and Gauss-Seidel iteration


Since we do not know the physical problem these equations originated from, it is difficult to make a

good first guess. Let’s use 0 for all three temperatures as an initial guess.

If we solve the equations in the order given for T1, T2, and T3 and solve by iteration, we find that the

solution is not stable. Let’s solve the first equation for T1, the second for T3, and the third for T2. For

Jacobi iteration we have



and for Gauss-Seidel iteration we have



The solution was carried out using a spreadsheet as shown on the next page





Applying the criterion that the temperature change per iteration should be less than 0.001, we see that

Jacobi iteration requires 7 iterations while Gauss-Seidel iteration requires 6 iterations.

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