stan-dev/stan — pull request #912 by PeterLi2016 (2014-08-27 14:24:01+00:00)
Title: Feature/issue 891 check equal nan

#### Summary:
Added NaN test and doc in code for check_equal.

#### Intended Effect:
Added NaN test and doc in code for check_equal.

#### How to Verify:
Run test/unit/math/error_handling/check_equal

#### Side Effects:
None.

#### Documentation:
Added doc in the code.

#### Reviewer Suggestions:
Anyone.