shravank shravan-kuchkula
shravan-kuchkula
/ forLoopInR.R
Created
March 31, 2017 18:16
A safer way to write a for loop in R. Use seq_along() to handle an empty data frame. Useful when using a for loop within a function.
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| df <- data.frame( | |
| a = rnorm(10), | |
| b = rnorm(10), | |
| c = rnorm(10), | |
| d = rnorm(10) | |
| ) | |
| # Replace the 1:ncol(df) sequence | |
| for (i in seq_along(df)) { | |
| print(median(df[[i]])) |
shravan-kuchkula
/ installRequiredPackages.R
Created
March 31, 2017 08:54
Install and load packages in R
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| # Install a package and load it. | |
| installRequiredPackages <- function(pkg){ | |
| new.pkg <- pkg[!(pkg %in% installed.packages()[,"Package"])] | |
| if (length(new.pkg)) | |
| install.packages(new.pkg, dependencies = TRUE) | |
| sapply(pkg, require, character.only = TRUE) | |
| } | |
| libs <- c("readr", "dplyr", "tidyr", "ggplot2", | |
| "magrittr", "markdown", "knitr", "Hmisc", |
shravan-kuchkula
/ generateWordCloud.R
Last active
March 31, 2017 08:57
Create a word cloud from a list of tweets.
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| # Takes a list of status/twitter objects, extracts the text, | |
| # cleans the text, calculates word frequencies and generates | |
| # a word cloud. | |
| generateWordCloud <- function(tweets){ | |
| #Get the text from the status/twitter object | |
| tweets_list <- sapply(tweets, function(x) x$getText()) | |
| #Remove any weird symbols from the text | |
| tweets_list <- str_replace_all(tweets_list, "[^[:graph:]]", " ") |
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