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I understand ? is used to access data, such as column in Frame, but the returned column will be in float. How about assignment of new column in a Frame?

 let second = Series.ofValues(["d";"e";"f"])
 let df?second = second

I tested this new column will stay as string, actually, I just would like to know if there is a place that systematically explain the use of ? operator.

tesla1060
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    This question may be simple. but such question is answered in python/pandas community. Whoever downvote this is discourage ppl adopting F#/Deedle – tesla1060 Mar 06 '16 at 11:41

1 Answers1

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Think maybe that https://github.com/BlueMountainCapital/Deedle/blob/master/docs/content/frame.fsx from line 231 and downwards gives some explanations on how to use it.

It does not explain other hows or whys, but might be what you need or want...

Helge Rene Urholm
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