add data file
add data.mat
Merge branch 'master' of https://github.com/rayjim/python_proj into imac_branch
Merge branch 'master' into imac_branch

* master:
  add classification problem
  A was generated by matlab code
  minimize
  new change
  data
  add approximate 2
  add approximate 2
  add newton and approximate newton to
add new algorithm to solve linear equation quickly
add new algorithm to solve linear equation quickly
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