Extract multiple columns from one instrument

In addition to the functions that extract a single column, the quantmod package also provides several functions you can use to extract a specific set of columns. You might recognize them, especially if you looked at help("OHLC.Transformations") during the last exercise.

Recall that OHLC is short-hand for open, high, low, close. So you can easily guess what columns the OHLC() and HLC() functions extract. There's also an OHLCV() function, which extracts the open, high, low, close, and volume columns.

These functions are helpful when you need to pass a set of columns to another function. For example, you might need to pass the high, low, and close columns (in that order) to a technical indicator function from the TTR package.

In this exercise, you will use two of these extractor functions to extract columns from the same DC object you used in the last exercise.

Instructions

Use one extractor function to create an object named dc_hlc that contains the high, low, and close columns of DC.
View the first few rows of dc_hlc.
Now extract the open, high, low, close, and volume columns from DC and assign the result to an object named dc_ohlcv.
View the first few rows of dc_ohlcv.

Take Hint (-30xp)