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Demo of R tutorial
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| x <- 1:99 | |
| y = x^2 / exp(x) | |
| plot(x, y) | |
| pkgs <- c("downloader", "readxl") | |
| install.packages(pkgs) | |
| lapply(pkgs, library, character.only = T) | |
| dir.create("big-data") | |
| download("http://tinyurl.com/r-for-bd-8", | |
| "big-data/UKWCS.xls", mode = "wb") | |
| wcs <- read_excel("big-data//UKWCS.xls") | |
| edu <- wcs$highedu | |
| edu_f <- as.factor(edu) | |
| levels(edu_f) | |
| plot(edu_f) | |
| levels(edu_f) <- c("Alev", "Univ", "None", "Olev") | |
| edu_f <- factor(edu_f, | |
| levels(edu_f)[c(2, 1, 4, 3)]) | |
| plot(edu_f) |
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