DOC: Added example to NDFrame.where
I think adding how this can emulate np.where would also be useful (add in a Note section for that) 
 from your expl on SO
 ## [Current coverage](https://codecov.io/gh/pydata/pandas/pull/13798?src=pr) is 85.28% (diff: 100%)

> Merging [#13798](https://codecov.io/gh/pydata/pandas/pull/13798?src=pr) into [master](https://codecov.io/gh/pydata/pandas/branch/master?src=pr) will increase coverage by **<.01%**

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  Files           139        139          
  Lines         50214      50214          
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+ Hits          42822      42823     +1   
+ Misses         7392       7391     -1   
  Partials          0          0          
```

> Powered by [Codecov](https://codecov.io?src=pr). Last update [a0d05db...6ae0e79](https://codecov.io/gh/pydata/pandas/compare/a0d05dbf7477df863486d82a0cdd4e3e93023864...6ae0e79a63978513664340e54309b9c426e4e3b7?src=pr)
 1. Added DataFrame.where/numpy.where example
2. Updated note according to @jorisvandenbossche and @jreback comments

Thanks for feedback!
 can you update
 Yep, will do.

On Tue, Aug 9, 2016 at 7:23 PM Jeff Reback notifications@github.com wrote:

> can you update
> 
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> https://github.com/pydata/pandas/pull/13798#issuecomment-238722585, or mute
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> .
 I noticed that most examples on the method's page use the `>>>` syntax. Is it ok to use the `.. ipython:: python` rst directive to generate them?
 @jalexvig no, use the doc-string syntax. These are viewable from the command line, not generated docs (they are generated too, but that's not the primary use)
 @jalexvig Thanks a lot!
