Talk:Biconjugate gradient method

Scalars and Vectors

I've implemented this algorithm, and in the presentation, someone needs to more clearly differentiate between the terms that are scalars and those that aren't. For instance, ${\alpha }_{k}$ and ${\beta }_{k}$ are scalars and the rest are not.CFDFEM (talk) 20:39, 1 September 2009 (UTC)[reply]

I suppose it is more or less a convention that Greek letters are usually used for scalars, lowercase letters for vectors and uppercase letters for matrices, though personally I would prefer further having vectors and matrices in bold type for better distinction.Kxx (talk) 05:13, 3 September 2009 (UTC)[reply]

Additional citations needed

The only source cited by this article is the R. Fletcher's paper that originally proposed BiCG. Fletcher's paper describes only the unpreconditioned BiCG for real systems (evidenced by use of simple transpose instead of conjugate transpose) and contains limited discussion of properties of BiCG (biorthogonality, biconjugacy and finiteness only). Additional citations are needed to support contents beyond what is in Fletcher's paper.Kxx (talk) 07:28, 8 January 2010 (UTC)[reply]

Kxx, in 2011, ServiceAT added a reference. I think it addresses this problem, but inline citations are still desired. Gryllida 05:49, 11 September 2013 (UTC)[reply]