Weights in block iterative methods

Document Type : Research Paper


Department of Mathematics, Iran University of Science and Technology, Tehran 16846-13114, Iran.


In this paper we introduce a sequential block iterative method and its simultaneous version with optimal combination of weights (instead of convex combination) for solving convex feasibility problems. When the intersection of the given family of convex sets is nonempty, it is shown that any sequence generated by the given algorithms converges to a feasible point. Additionally for linear feasibility problems, we give equivalency of our algorithms with sequential and simultaneous block Kaczmarz methods explaining the optimal weights have been inherently used in Kaczmarz methods. In addition, a convergence result is presented for simultaneous block Kaczmarz for the case of inconsistent linear system of equations.


  • Receive Date: 16 February 2013
  • Revise Date: 01 February 2014
  • Accept Date: 15 February 2014