[R] using data.table ,plyr

[arun]

Hi,

You could try:
library(dplyr) 

 A %.% group_by(author_id) %.% arrange(desc(prob)) %.% summarise(paper_id=paste(paper_id,collapse=","))



A.K.


On Thursday, March 27, 2014 11:40 AM, Rohit Gupta <rhtgpt789 at gmail.com> wrote:
I have a data A which looks like


    author_id paper_id prob
       731    24943    1
       731    24943    1
       731   688974    1
       731   964345    .8
       731  1201905    .9
       731  1267992    1
       736    249      .2
       736   6889      1
       736   94345    .7
       736  1201905    .9
       736  126992    .8

The output I am desiring is:

    author_id    paper_id
      731        24943,24943,688974,1201905,964345
      736        6889,1201945,126992,94345,249

That is paper_id are arranged according to decreasing order of
probability.How could this be done?

Thanks

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