Question

In many one-dimensional problems, the banded matrix has only two columns. Here NBW=____

(a) 6

(b) 3

(c) 7

(d) 2

This question was posed to me in a job interview.

My question is from One Dimensional Problems in portion One Dimensional Problems of Finite Element Method

Answer 1

Right answer is (d) 2

For explanation I would say: NBW means half bandwidth. Many of the One- dimensional problems banded matrix has only 2 columns then NBW=2. We know that

NBW=max(Difference between dof numbers connecting an element)+1