Add a few comments

2014-11-14 14:08:17 -05:00 · 2014-11-14 14:08:17 -05:00 · 2733b66a23
parent 95adc49ac3
commit 2733b66a23
1 changed files with 2 additions and 0 deletions
--- a/gtsam/linear/Preconditioner.cpp
+++ b/gtsam/linear/Preconditioner.cpp
@ -125,7 +125,9 @@ void BlockJacobiPreconditioner::transposeSolve(const Vector& y, Vector& x) const
 void BlockJacobiPreconditioner::build(
  const GaussianFactorGraph &gfg, const KeyInfo &keyInfo, const std::map<Key,Vector> &lambda)
 {
+  // n is the number of keys
  const size_t n = keyInfo.size();
+  // dims_ is a vector that contains the dimension of keys
  dims_ = keyInfo.colSpec();

  /* prepare the buffer of block diagonals */