Created
December 9, 2013 09:30
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Example of for almevents function of alm package. Retrieve all tweets about a vector of DOIs, do some basic formatting and return data frame.
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| library(alm) | |
| dois <- c("10.1371/journal.pbio.1001535","10.1371/journal.pone.0046362","10.1371/journal.pmed.0020124","10.1371/journal.pntd.0001969","10.1371/journal.pone.0040259") | |
| api_key <- "YOUR_KEY" | |
| response <- almevents(doi=dois, source="twitter",key=api_key) | |
| events <- data.frame() | |
| for (i in 1:length(dois)) { | |
| row <- response[[i]][["twitter"]] | |
| row$doi <- dois[i] | |
| # remove "user_profile_image" column | |
| row$user_profile_image <- NULL | |
| # format "created_at" column, need to set locale | |
| lct <- Sys.getlocale("LC_TIME"); Sys.setlocale("LC_TIME", "C") | |
| if (substr(row$created_at,4,4)[[1]] == ",") { | |
| row$created_at <- strftime(strptime(row$created_at, "%a, %d %b %Y %H:%M:%S %z")) | |
| } else { | |
| row$created_at <- strftime(strptime(row$created_at, "%a %b %d %H:%M:%S %z %Y")) | |
| } | |
| Sys.setlocale("LC_TIME", lct) | |
| # remove linefeeds and extra spaces from "text" column | |
| row$text <- gsub("[[:space:]]+", " ", row$text) | |
| events <- rbind(events,row) | |
| } |
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