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January 2, 2017 16:25
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Save mGalarnyk/f3242633441fec2171fa63195938ddaa to your computer and use it in GitHub Desktop.
complete.R This file is used for the John Hopkins Data Science Specialization (R Programming). This file is posted for the blog post reviewing the specialization https://medium.com/@GalarnykMichael/in-progress-review-course-2-r-programming-jhu-coursera-ad27086d8438#.ui3hb8n46
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| complete <- function(directory, id = 1:332) { | |
| # Format number with fixed width and then append .csv to number | |
| fileNames <- paste0(directory, '/', formatC(id, width=3, flag="0"), ".csv" ) | |
| # Reading in all files and making a large data.table | |
| lst <- lapply(fileNames, data.table::fread) | |
| dt <- rbindlist(lst) | |
| return(dt[complete.cases(dt), .(nobs = .N), by = ID]) | |
| } | |
| #Example usage | |
| complete(directory = '~/Desktop/specdata', id = 20:30) |
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