#### Frequently asked questions, Computational Algebra

#### Q: What is meant by growth factor in Assignment 1.2?

A: The quotient between the largest element in factors L and U and the largest
element in the original matrix A. A large growth factor means that you get
a large rounding error.

#### Q: What is meant by error in the solution in Ass 1.2?

A: If you know the exact solution it is

||e||=||x_{computed}-x_{exact}||

Otherwize you use the residual

||r||=||Ax_{computed}-b||

Try with an arbitrary vector b! Often the error is growing faster than the
residual, when the matrix gets ill conditioned.

#### Q: How do I make my files availble to my collaborator?

A: Try the fs command! I think you should write

>fs setacl* catalogue-name other-user* rlidw

Replace italic text by the appropriate. The last is a set of options

r read

l list

i insert

d delete

w write