Here is how you would get the data for AAPL and GOOG. To do this, you would need to use lapply in combination with getSymbols. You may also want to get more than one variable.

The variable is also saved as an xts object, which is useful as it allows for easy time-manipulation. If you want to disable this function, you would set auto.assign to FALSE. getSymbols, by default, will save the ticker history as a variable with the ticker name. You might notice that one does not need to save it as a variable. # AAPL.Open AAPL.High AAPL.Low AAPL.Close AAPL.Volume You can preview the first few rows of the data using the head() function. The data will be loaded in the AAPL variable. # and getOption('') will still be checked for # 'loadSymbols' to automatically load data. # 'getSymbols' currently uses auto.assign=TRUE by default, but will Below is an example that gets the daily history of AAPL from 1 to 1. Once the package is installed, you would use the getSymbols function to download the data. You can download historical prices to a CSV file using the ' Download Data ' link above the Volume column. You can use URLs like to open pages with historical prices directly. To start using the Quantmod library, you can install and load it in your R environment using the following commands in R console or R Studio (Preferred). You can open search a ticker like AAPL, and click the ' Historical Data ' tab. This allows for downloading stock data from multiple sources, although Yahoo is the default option. We will use QuantMod R package to download stock data. map ( extractQuote ) const sumQuote = (, ) => const sumAllQuotes = allQuotes => allQuotes.

** * RxJS in Action * Listing 5.4 * Note: make sure you have turned on CORS sharing in you browser so that you can make * cross-site requests * Paul Daniels * Luis Atencio */ const ajax = url => new Promise ( ( resolve, reject ) => ] ) => // 3-tuple const fetchQuote$ = symbol => requestQuote$ ( symbol ).

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