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YAML current date in rmarkdown
...e field valid in YAML by quoting the inline R expression, e.g.
date: "`r format(Sys.time(), '%d %B, %Y')`"
Then the parsing error will be gone, and the date will be generated in the markdown output so Pandoc can use the value from Sys.time().
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How do I make a Git commit in the past?
I'm converting everything over to Git for my own personal use and I found some old versions of a file already in the repository. How do I commit it to the history in the correct order according the file's "date modified" so I have an accurate history of the file?
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Xcode 4 hangs at “Attaching to (app name)”
I just upgraded to Xcode 4 and for some reason my app won't run in the simulator or iOS device. It was working perfectly in Xcode 3, but all of a sudden now when I press run the program stops at "Attaching to...". There doesn't seem to be any other info to help with this problem either.
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How can I find where Python is installed on Windows?
I want to find out my Python installation path on Windows. For example:
19 Answers
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Given a URL to a text file, what is the simplest way to read the contents of the text file?
In Python, when given the URL for a text file, what is the simplest way to access the contents off the text file and print the contents of the file out locally line-by-line without saving a local copy of the text file?
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How to find all links / pages on a website
...nd links on ANY given website? I'd like to enter a URL and produce a directory tree of all links from that site?
5 Answers
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How to convert array values to lowercase in PHP?
...yourArray = array_map('mb_strtolower', $yourArray); I just checked and it worked for Cyrillic
– user3841429
May 6 at 2:39
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Weighted random numbers
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There is a straightforward algorithm for picking an item at random, where items have individual weights:
1) calculate the sum of all the weights
2) pick a random number that is 0 or greater and is less than the sum of the weights
3) go throug...
Step-by-step debugging with IPython
...You can use IPython's %pdb magic. Just call %pdb in IPython and when an error occurs, you're automatically dropped to ipdb. While you don't have the stepping immediately, you're in ipdb afterwards.
This makes debugging individual functions easy, as you can just load a file with %load and then run a...
Command to get time in milliseconds
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date +%s%N returns the number of seconds + current nanoseconds.
Therefore, echo $(($(date +%s%N)/1000000)) is what you need.
Example:
$ echo $(($(date +%s%N)/1000000))
1535546718115
date +%s returns the number of seconds since the epoch, if that's useful.
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