The author is wrong-in assuming that the algorithm in  are the same algorithms that were published earlier in . The algorithm in  is the conjugate gradient a la "Fletcher Reeves" whereas the algorithm in  is a modified version of the algorithm proposed by Towsend and Johnson . To an interested reader, there are many papers in the mathematical literature which elaborate on the different versions of the conjugate gradient algorithm for nonlinear optimization problems. In , the difference between the Fletcher algorithm  and the algorithm used in  is outlined.
ASJC Scopus subject areas
- Control and Systems Engineering
- Signal Processing
- Computer Vision and Pattern Recognition
- Electrical and Electronic Engineering