Extract multiple columns from one instrument
The quantmod package provides functions to extract a single column, and also has functions to extract specific sets of columns.
Recall OHLC stands for open, high, low, close. Now you can guess which columns the OHLC() and HLC() functions extract. There's also an OHLCV() function, which adds the volume column.
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.
In this exercise, you will use two of these extractor functions on the same DC object you used in the last exercise.
Latihan ini adalah bagian dari kursus
Importing and Managing Financial Data in R
Petunjuk latihan
- Use one extractor function to create an object named
dc_hlcthat contains the high, low, and close columns ofDC. - View the first few rows of
dc_hlc. - Now extract the open, high, low, close, and volume columns from
DCand assign the result to an object nameddc_ohlcv. - View the first few rows of
dc_ohlcv.
Latihan interaktif praktis
Cobalah latihan ini dengan menyelesaikan kode contoh berikut.
# Extract the high, low, and close columns
# Look at the head of dc_hlc
# Extract the open, high, low, close, and volume columns
# Look at the head of dc_ohlcv