DataFrame to_json Column -> [values] orientation and scientifc notation?
Hi,
I'm exporting a data frame from pandas and importing it in a C++ program using rapidjson. I believe I have tested all available orientations and I am wondering if it was possible to obtain the following:

``` python
       c1 c2
    r1 1 2
    r2 3 4
```

converted to

``` python
{ c1: [1, 3], c2: [2,4], index: [r1, r2]}
```

Is my idea inherently flawed somehow? I feel it would be very intuitive to parse this from C++.

The other question is regarding the precision of the double values. I am only getting fixed-point values in the text output. 
Can I get 1.234e-5 instead of 0.00001234 somehow?

If no, can you point out the process for possible contributions in this direction?

Best regards,
Matthias Kauer
