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What does .SD stand for in data.table in R
...= rnorm(.N)]) is bad practice and can lead to silently corrupted code over time if column positions change. Even implicitly using numbers can be dangerous if we don't keep smart/strict control over the ordering of when we create the numbered index and when we use it.
Controlling a Model's RHS
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How to construct a WebSocket URI relative to the page URI?
I want to construct a WebSocket URI relative to the page URI at the browser side. Say, in my case convert HTTP URIs like
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What is that “total” in the very first line after ls -l? [closed]
What is the total in the output of ls -l ?
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For every character in string
How would I do a for loop on every character in string in C++?
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Find and Replace text in the entire table using a MySQL query
Usually I use manual find to replace text in a MySQL database using phpmyadmin. I'm tired of it now, how can I run a query to find and replace a text with new text in the entire table in phpmyadmin?
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How do I check in SQLite whether a table exists?
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We're counting the number of times the TABLE appears in sqlite schema. A count of 0 means the table doesn't exist. A count of 1 means the table does exist. These are the only two expected values of count.
– Stephen Quan
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How do you loop through currently loaded assemblies?
... "thread safe". Sure, that makes that block of code execute only one at a time; but other threads can load assemblies any time they like and that could cause problems with some of the foreach loops.
– Peter Ritchie
Mar 12 '15 at 21:39
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List of tables, db schema, dump etc using the Python sqlite3 API
For some reason I can't find a way to get the equivalents of sqlite's interactive shell commands:
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Regular Expression For Duplicate Words
I'm a regular expression newbie, and I can't quite figure out how to write a single regular expression that would "match" any duplicate consecutive words such as:
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Download a file by jQuery.Ajax
I have a Struts2 action in the server side for file downloading.
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