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Hello,
I have a consistent issue with `na_if()` returning an error when my data frame includes a date column, even when that column does not contain any values to be replaced by `NA`. If I exclude …
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@machow this exercise times out
https://campus.datacamp.com/courses/introduction-to-the-shell-at-princeton-public-library/working-with-file-contents?ex=1
I don't have permission to edit on Teach…
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The "docs" folder of pkgdown should not appear in the master.
This requires to change links to images/gif in the documentation because they won't be copied. A way is to store images in "man/figures…
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In [How do I restore an old version of a file?](https://campus.datacamp.com/courses/introduction-to-git-for-data-science/undo?ex=5), the logs feature different comments and hashes, but they all have t…
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In [How can I merge two branches with conflicts?](https://campus.datacamp.com/courses/introduction-to-git-for-data-science/working-with-branches?ex=8), different commands for the first and last instru…
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**Background**
"Hi, for some reason in Python class after I listened to the next session I’m able to run code but the submit answer seems to fail. Restart allows to run code again but I can’t submit …
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I am trying to write my data frame into multiple sheets by passing sheet names through a loop. But always found the last value store in the first sheet only. Below is my demo code to reproduce the re…
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ISL is too advanced for most in this course. Find alternative readings/videos for the basics of regression/classification. Maybe Khan academy or other written summaries online? Or write my own?
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## DataFrame or omitted double quotes?
* `print(mtcars)` or `print("mtcars")`
* impact of `check_output_expr()`
[Source](https://datacamp.github.io/testwhat/articles/glossary.html#check-output)
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```
landed %
filter(page_url_path %in% c('/home', '/home/'),
page_view_start > "2018-07-01") %>%
select(tstamp = page_view_start, user_id = signed_in_user_id)
exercises %
fil…