Yes. A data.frame is basically a list where all elements are vectors of
the same length. So this issue also exists in a data.frame. However, the
data.frame construction method will detect this and generate unique
names (which also might not be what you want):
> data.frame(a=1:3, a=1:3)
a a.1
1 1
1
2 2 2
3 3 3
But still with a little effort you can still create a data.frame with
multiple columns with the same name. But as Duncan Murdoch mentions you
can usually control for that.
Best,
Jan
On 02-11-2021 11:32, Yonghua Peng wrote:
But for data.frame the colnames can be duplicated. Am I right?
Regards.
On Tue, Nov 2, 2021 at 6:29 PM Jan van der Laan <rh...@eoos.dds.nl
<mailto:rh...@eoos.dds.nl>> wrote:
True, but in a lot of cases where a python user might use a dict an R
user will probably use a list; or when we are talking about arrays of
dicts in python, the R solution will probably be a data.frame (with
each
dict field in a separate column).
Jan
On 02-11-2021 11:18, Eric Berger wrote:
> One choice is
> new.env(hash=TRUE)
> in the base package
>
>
>
> On Tue, Nov 2, 2021 at 11:48 AM Yonghua Peng <y...@pobox.com
<mailto:y...@pobox.com>> wrote:
>
>> I know this is a newbie question. But how do I implement the
hash structure
>> which is available in other languages (in python it's dict)?
>>
>> I know there is the list, but list's names can be duplicated here.
>>
>>> x <- list(x=1:5,y=month.name <http://month.name>,x=3:7)
>>
>>> x
>>
>> $x
>>
>> [1] 1 2 3 4 5
>>
>>
>> $y
>>
>> [1] "January" "February" "March" "April" "May"
"June"
>>
>> [7] "July" "August" "September" "October"
"November" "December"
>>
>>
>> $x
>>
>> [1] 3 4 5 6 7
>>
>>
>>
>> Thanks a lot.
>>
>> [[alternative HTML version deleted]]
>>
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>> and provide commented, minimal, self-contained, reproducible code.
>>
>
> [[alternative HTML version deleted]]
>
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<http://www.R-project.org/posting-guide.html>
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>
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______________________________________________
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