Thanks. That's a pretty clear example. "Compute the average grade for each
socioeconomic group" is obviously useful and it is not expressed naturally
with regular arrays.
Cheers,
Daniel.
On 25 October 2014 18:51, Cedric St-Jean wrote:
> Yeah, whenever you have a matrix of data and each column r
Yeah, whenever you have a matrix of data and each column represents
something different, then using a DataFrame is very convenient (and that's
really all there is to it - convenience). For instance, given student exam
data I might express "Compute the average grade for each socioeconomic
group"
Consider doing research in any domain (e.g. epidemiology, economics,
psychology, sociology, consumer research,...) where you measure N variables
(each having a different type) about a single unit of observation. Then the
DataFrame is the most natural representation of that domain’s data.
— Joh
Thanks.
On 25 October 2014 17:32, Tamas Papp wrote:
> You may find the "Tidy Data" paper by H. Wickham is a good introduction:
> http://vita.had.co.nz/papers/tidy-data.pdf
>
> It uses R's syntax, but I think R influenced the design of the Julia
> libray a lot.
>
> Best,
>
> Tamas
>
> On Sat, Oct
There was a time when my job was to write database-driven web applications.
I worked with MySQL a lot. I understand that a data frame has the same type
of content as a database, but they do not seem to be used to solve the same
types of problems as something like MySQL. I thought data frames were u
You may find the "Tidy Data" paper by H. Wickham is a good introduction:
http://vita.had.co.nz/papers/tidy-data.pdf
It uses R's syntax, but I think R influenced the design of the Julia
libray a lot.
Best,
Tamas
On Sat, Oct 25 2014, Daniel Carrera wrote:
> Hello,
>
> This is a fairly naive que
Have you ever used a database? A DataFrame is just a database that’s stored in
memory.
— John
On Oct 25, 2014, at 5:37 AM, Daniel Carrera wrote:
> Hello,
>
> This is a fairly naive question. I have observed for the last two years that
> many people really like data frames. R users obviously
Hello,
This is a fairly naive question. I have observed for the last two years
that many people really like data frames. R users obviously like them, and
the Python and Julia communities thought it was worth adding that feature
to their languages too. However, as an astronomer, I have not yet h
