select() dplyr verb
select() is used to pull out certain columns from your data.
Selecting columns with
Here we use
select()to pull out the
select(ticker, date, close)
Chaining Transformations Together: Filtering, selecting and arranging
We can chain transformations together using the pipe operator %>%.
If you’re unsure how the pipe operator works, visit Robot Wealth website to watch a video on this topic.
We’re going to chain together a transformation which:
- filters out a single stock
- selects the date and close price
- re-arranges by date descending.
filter(ticker == ‘XOM’) %>%
select(date, close) %>%
When debugging a dplyr pipeline, it can be helpful to select each transformation one by one, and press CTRL-Enter in Rstudio to just run the selected transformation.
Visit Robot Wealth website to read the full article and download code: https://robotwealth.com/financial-data-manipulation-in-dplyr-for-quant-traders/
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