Hi

From: Sunny Singha [mailto:sunnysingha.analyt...@gmail.com]
Sent: Monday, March 14, 2016 10:37 AM
To: r-help; PIKAL Petr
Subject: Re: [R] Please help -- Cbind data frames within LIST() in R

Thanks Petr,
I'm going through the link that you have provided. Merge won't be useful in my 
case. Let me give the complete picture of what I'm trying to achieve.

Why do you think so? If you have several data frames of unequal length with 
some common column I am almost sure that you want to align all values according 
to this common column.

I'm extracting data from fb pages. I have the data frame 'pages_df' which has 
all the details of the fb pages. 'Page_id' is the important column in it to get 
all the posts from that page.
I have created below function to which page_id is passed and data frame is 
created separately for 'posts.csv', 'comments.csv', 'likescsv'.
Ideally this is not what I want as the final output. I want to modify this 
function so that it outputs single flat file where columns of
each posts, comments and likes are cbinded.

# Function to scrap facebook pages' posts, comments and likes
page_data_extract <- function(pg_id){
  cat('Extracting list of posts from page', pg_id, '\n')
  page <- getPage(pg_id, token=fb_oauth, since='2016/03/01') # This function 
extracts posts metadata from page_id argument specified.
  # Loop to information of the post.
  for(i in 1:nrow(page)){
    path_dat <- <custom_path>
    cat('\nScrapping post \n',page$id[i])

    posts <- getPost(page$id[i], n=100, token =fb_oauth)
    time <- format(Sys.time(), '%b_%d_%Y')
    for(j in 1:length(posts)){
      myfile <- file.path(path_data, paste0(names(posts[j]), time, '_', i, 
'.csv'))
      write.csv(posts[[j]], file=myfile, row.names = F)
    }
  }
}

I get this error with your code
+     path_dat <- <custom_path>
Error: unexpected '<' in:
"  for(i in 1:nrow(page)){
    path_dat <- <"
>     cat('\nScrapping post \n',page$id[i])
Error in page$id : object of type 'closure' is not subsettable
>
So please follow Posting guide for this help list if you really want some 
usefull answers:
No HTML, only plain text mails.
Reproducible code
Some toy data e.g. by posting result of
dput(head(pages_df, 20))
Cheers
Petr

Here I call the above function:
 # Call page_data_extract() function for each pages found to gather posts, 
comments & Likes
for(i in 1:nrow(pages_df)){
    e_catch <- try(page_data_extract(pages_df$id[i]))
    if(isTRUE(all.equal(class(e_catch), 'try-error'))){
      cat('No public posts were found for == 
',pages_df$name[i],'(',pages_df$id[i],')\n\n')
    }
}
Regards,
Sunny

On Mon, Mar 14, 2016 at 1:19 PM, PIKAL Petr 
<petr.pi...@precheza.cz<mailto:petr.pi...@precheza.cz>> wrote:
Hi

There are several options e.g.

http://stackoverflow.com/questions/6988184/combining-two-data-frames-of-different-lengths
http://stackoverflow.com/questions/7196450/create-a-data-frame-of-unequal-lengths

but maybe you want to do actually merging

see

?merge

Cheers
Petr

> -----Original Message-----
> From: R-help 
> [mailto:r-help-boun...@r-project.org<mailto:r-help-boun...@r-project.org>] On 
> Behalf Of Sunny
> Singha
> Sent: Monday, March 14, 2016 8:16 AM
> To: r-help
> Subject: [R] Please help -- Cbind data frames within LIST() in R
>
> Hi,
> Please help and guide. I want to cbind dataframes within the list
> object:
> List object 'post_data' contains below sampled data frames:
>
> post_data
> $posts
>       from_id user_name post_msg
>
> $comm
>        comm_id from_id message
>
> $Likes
>        username like_id
>
>
> *Note: The columns in each data frame are of unequal length. hence,
> missing values will be filled with 'NA' after combining* Regards, Sunny
>
>       [[alternative HTML version deleted]]
>
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> R-help@r-project.org<mailto:R-help@r-project.org> mailing list -- To 
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svého systému.
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jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat.
Odesílatel e-mailu neodpovídá za eventuální škodu způsobenou modifikacemi či 
zpožděním přenosu e-mailu.

V případě, že je tento e-mail součástí obchodního jednání:
- vyhrazuje si odesílatel právo ukončit kdykoliv jednání o uzavření smlouvy, a 
to z jakéhokoliv důvodu i bez uvedení důvodu.
- a obsahuje-li nabídku, je adresát oprávněn nabídku bezodkladně přijmout; 
Odesílatel tohoto e-mailu (nabídky) vylučuje přijetí nabídky ze strany příjemce 
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- trvá odesílatel na tom, že příslušná smlouva je uzavřena teprve výslovným 
dosažením shody na všech jejích náležitostech.
- odesílatel tohoto emailu informuje, že není oprávněn uzavírat za společnost 
žádné smlouvy s výjimkou případů, kdy k tomu byl písemně zmocněn nebo písemně 
pověřen a takové pověření nebo plná moc byly adresátovi tohoto emailu případně 
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