[R] help with LDA topic modelling..

dear members, I am using LDA for topic modelling of news articles (topicmodels package). I am visualizing the accuracy with the LDAvis package. The visualization shows clusters as circles, probably intersecting. My question is, if a find the optimal number of topics, k,

Re: [R] Sum every n (4) observations by group

Milu, Your data seems to be very consistent in that each value of ID has eight rows. You seem to want to just sum every four so that fits: ID Date Value 1 A 4140 0.000207232 2 A 4141 0.000240141 3 A 4142 0.000271414 4 A 4143 0.000258384 5 A 4144 0.000243640 6 A 4145

Re: [R] Sum every n (4) observations by group

Dear Peter, Thanks so much for your reply and the code! This is helpful. What I would like is the data.frame below - sum values for *4140, 4141, 4142, 4143 *and then for *4144, 4145, 4146, 4147 *for IDs A, B, and C. Does that make sense? Thanks again! Best. Milu results <- structure(list(ID =

Re: [R] Sum every n (4) observations by group

I'm not sure I understand the task, but if I do, assuming your data frame is assigned to a variable named df, I would do something like sumNs = function(x, n) { if (length(x) %%n !=0) stop("Length of 'x' must be a multiple of 'n'.") n1 = length(x)/n ind = rep(1:n1, each = n) tapply(x,

[R] Sum every n (4) observations by group

Dear all, I have a dataset (below) by ID and time sequence. I would like to sum every four observations by ID. I am confused how to combine the two conditions. Any help will be highly appreciated. Thank you! Best. Milu ## Dataset structure(list(ID = c("A", "A", "A", "A", "A", "A", "A", "A",

Re: [R] Bug in list.files(full.names=T)

I don't know the answer to your question, but I see the same behaviour on MacOS, e.g. list.files("./") includes ".//R" in the results on my system. Both "./R" and ".//R" are legal ways to express that path on MacOS, so it's not a serious bug, but it does look ugly. Duncan Murdoch On

[R] Speed up studentized confidence intervals ?

Dear R-experts, Here below my R code working but really really slowly ! I need 2 hours with my computer to finally get an answer ! Is there a way to improve my R code to speed it up ? At least to win 1 hour ;=) Many thanks library(boot)

[R] Bug in list.files(full.names=T)

Dear everybody, I'm a researcher in the field of psychology and a passionate R user. After having updated to the newest version, I experienced a problem with list.files() if the parameter full.names is set to TRUE. A path separator "/" is now always appended to path in the output even if path %>%