[Numpy-discussion] How to merge or SQL join record arrays in Python?

Wei Su taste_of_r@yahoo....
Mon May 11 17:18:03 CDT 2009


 
Hi, Pierre:
 
Thanks for the reply. I can now actually turn a big list into a record array. My question is actually how to join related record arrays in Python. This is done in SAS by MERGE and PROC SQL and by merge() in R. But I have no idea how to do it in Python.
 
Thanks.
 
Wei Su

--- On Mon, 5/11/09, Pierre GM <pgmdevlist@gmail.com> wrote:


From: Pierre GM <pgmdevlist@gmail.com>
Subject: Re: [Numpy-discussion] How to merge or SQL join record arrays in Python?
To: "Discussion of Numerical Python" <numpy-discussion@scipy.org>
Date: Monday, May 11, 2009, 10:03 PM



On May 11, 2009, at 5:44 PM, Wei Su wrote:
>
> Coming from SAS and R, this is probably the first thing I want to do  
> now that I can convert my data into record arrays. But I could not  
> find any clues after googling for a while. Any hint or suggestions  
> will be great!

That depends what you want, actually, ut this should get you started
http://docs.scipy.org/doc/numpy/user/basics.rec.html

Note the slight difference between a structured array (fields  
accessible as items) and a recarray (fields accessible as items and  
attributes). 
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