/exchange-rates.R
Last active Aug 19, 2019
Convenience functions for https://openexchangerates.org/
| # (1) Get a free plan from https://openexchangerates.org/signup/free | |
| # (2) Tell this function your API key -- Sys.setenv("OER_KEY", "your-key-here") | |
| getDay <- function(day) { | |
| u <- sprintf( | |
| "https://openexchangerates.org/api/historical/%s.json?app_id=%s", | |
| day, Sys.getenv("OER_KEY") | |
| ) | |
| res <- jsonlite::fromJSON(u) | |
| # convert timestamp to date object | |
| # http://stackoverflow.com/questions/13456241/convert-unix-epoch-to-date-object-in-r | |
| res$rates$date <- as.POSIXct(res$timestamp, origin = "1970-01-01") | |
| data.frame(res$rates) | |
| } | |
| getRates <- function(start = end - 3, end = Sys.Date()) { | |
| days <- seq(start, end, by = "1 day") | |
| Reduce("rbind", lapply(days, getDay)) | |
| } | |
| dat <- getRates() | |
| dat[, c("AUD", "NZD", "date")] | |
| #> AUD NZD date | |
| #> 1 1.403416 1.528405 2015-11-13 10:00:00 | |
| #> 2 1.402924 1.529136 2015-11-14 10:00:00 | |
| #> 3 1.402924 1.529136 2015-11-15 10:00:00 | |
| #> 4 1.402924 1.529136 2015-11-15 12:00:11 |
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