[R] Converting a list to a data frame

[Duncan Murdoch]

Others have shown you how to extract the matrix and convert it to a 
dataframe.  My only addition is to suggest that you don't do this: 
matrix methods are often much more efficient than dataframe methods, so 
if you can work with the matrix without conversion, you'll often find 
things run a lot faster.

Duncan Murdoch

On 24/07/2021 9:18 a.m., Jeff Reichman wrote:
> How does one convert a list into a data frame?
> 
>   
> 
>> str(weight_chains)
> 
> List of 1
> 
> $ : 'mcmc' num [1:100000, 1:3] -105 -105 -105 -104 -103 ...
> 
>    ..- attr(*, "dimnames")=List of 2
> 
>    .. ..$ : NULL
> 
>    .. ..$ : chr [1:3] "a" "b" "s"
> 
>    ..- attr(*, "mcpar")= num [1:3] 1001 101000 1
> 
> - attr(*, "class")= chr "mcmc.list"
> 
>   
> 
> Such that ..
> 
>   
> 
>>
> 
> weight_chains
> 
> 
> 
>                 a         b         s
> 
> 1     -104.72512 1.0141407  9.369227
> 
> 2     -104.52297 1.0167432  9.131354
> 
> 3     -104.72669 1.0139528  9.219877
> 
>   
> 
> 
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> 
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