How can I insert values into a data frame dynamically using R - r

Question

After scraping some review data from a website, I am having difficulty organizing the data into a useful structure for analysis. The problem is that the data is dynamic, in that each reviewer gave ratings on anywhere between 0 and 3 subcategories (denoted as subcategories "a", "b" and "c"). I would like to organize the reviews so that each row is a different reviewer, and each column is a subcategory that was rated. Where reviewers chose not to rate a subcategory, I would like that missing data to be 'NA'. Here is a simplified sample of the data:
vec <- c("a","b","c","stop", "a","b","stop", "stop", "c","stop")
ratings <- c(2,5,1, 1,3, 2)
The vec contains the information of the subcategories that were scored, and the "stop" is the end of each reviewers rating. As such, I would like to organize the result into a data frame with this structure. Expected Output
I would greatly appreciate any help on this, because I've been working on this issue for far longer than it should take me..

Answer 1

#alexis_laz provided what I believe is the best answer:
vec <- c("a","b","c","stop", "a","b","stop", "stop", "c","stop")
ratings <- c(2,5,1, 1,3, 2)
stops <- vec == "stop"
i = cumsum(stops)[!stops] + 1L
j = vec[!stops]
tapply(ratings, list(factor(i, 1:max(i)), factor(j)), identity) # although mean/sum work
# a b c
#[1,] 2 5 1
#[2,] 1 3 NA
#[3,] NA NA NA
#[4,] NA NA 2

Answer 2

base R, but I'm using a for loop...
vec <- c("a","b","c","stop", "a","b","stop", "stop", "c","stop")
ratings <- c(2,5,1, 1,3, 2)
categories <- unique(vec)[unique(vec)!="stop"]
row = 1
df = data.frame(lapply(categories, function(x){NA_integer_}))
colnames(df) <- categories
rating = 1
for(i in vec) {
if(i=='stop') {row <- row+1
} else { df[row,i] <- ratings[[rating]]; rating <- rating+1}
}

Answer 3

Here is one option
library(data.table)
library(reshape2)
d1 <- as.data.table(melt(split(vec, c(1, head(cumsum(vec == "stop")+1,
-1)))))[value != 'stop', ratings := ratings
][value != 'stop'][, value := as.character(value)][, L1 := as.integer(L1)]
dcast( d1[CJ(value = value, L1 = seq_len(max(L1)), unique = TRUE), on = .(value, L1)],
L1 ~value, value.var = 'ratings')[, L1 := NULL][]
# a b c
#1: 2 5 1
#2: 1 3 NA
#3: NA NA NA
#4: NA NA 2

Answer 4

Using base R functions and rbind.fill from plyr or rbindlist from data.table to produce the final object, we can do
# convert vec into a list, split by "stop", dropping final element
temp <- head(strsplit(readLines(textConnection(paste(gsub("stop", "\n", vec, fixed=TRUE),
collapse=" "))), split=" "), -1)
# remove empty strings, but maintain empty list elements
temp <- lapply(temp, function(x) x[nchar(x) > 0])
# match up appropriate names to the individual elements in the list with setNames
# convert vectors to single row data.frames
temp <- Map(function(x, y) setNames(as.data.frame.list(x), y),
relist(ratings, skeleton = temp), temp)
# add silly data.frame (single row, single column) for any empty data.frames in list
temp <- lapply(temp, function(x) if(nrow(x) > 0) x else setNames(data.frame(NA), vec[1]))
Now, you can produce the single data.frame (data.table) with either plyr or data.table
# with plyr, returns data.frame
library(plyr)
do.call(rbind.fill, temp)
a b c
1 2 5 1
2 1 3 NA
3 NA NA NA
4 NA NA 2
# with data.table, returns data.table
rbindlist(temp, fill=TRUE)
a b c
1: 2 5 1
2: 1 3 NA
3: NA NA NA
4: NA NA 2
Note that the line prior to the rbinding can be replaced with
temp[lengths(temp) == 0] <- replicate(sum(lengths(temp) == 0),
setNames(data.frame(NA), vec[1]), simplify=FALSE)
where the list items that are empty data frames are replaced using subsetting instead of an lapply over the entire list.