Question

While solving a system of equations with the Thomas algorithm, in which order are the values of Pi and Qi found?

(a) Backwards

(b) Forward

(c) Simultaneously

(d) Depends on the problem

I had been asked this question in semester exam.

I want to ask this question from Discretization Aspects topic in section Basic Aspects of Discretization, Grid Generation with Appropriate Transformation of Computational Fluid Dynamics

Answer 1

Right answer is (b) Forward

For explanation I would say: To find the current values of Pi and Qi, the previous values Pi-1 and Qi-1 should be known. So, this is started from the first equation and done in forward order.