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How do you detect where two line segments intersect? [closed]
...tion algorithm from the article "Intersection of two lines in three-space" by Ronald Goldman, published in Graphics Gems, page 304. In three dimensions, the usual case is that the lines are skew (neither parallel nor intersecting) in which case the method gives the points of closest approach of the ...
Delete duplicate rows from small table
...ING (
SELECT MIN(ctid) as ctid, key
FROM dups
GROUP BY key HAVING COUNT(*) > 1
) b
WHERE a.key = b.key
AND a.ctid <> b.ctid
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Sleep until a specific time/date
...
As mentioned by Outlaw Programmer, I think the solution is just to sleep for the correct number of seconds.
To do this in bash, do the following:
current_epoch=$(date +%s)
target_epoch=$(date -d '01/01/2010 12:00' +%s)
sleep_seconds=$(...
How to sort Map values by key in Java?
...reTo() result of 0 is 'equals'. If you're writing a comparator that sorts by string length, then you need to return a positive or negative value based on which string is longer, and only return 0 if both strings are the same length. if a and b are strings you can do this like so `return a.length()...
Is it possible to disable floating headers in UITableView with UITableViewStylePlain?
...
You should be able to fake this by using a custom cell to do your header rows. These will then scroll like any other cell in the table view.
You just need to add some logic in your cellForRowAtIndexPath to return the right cell type when it is a header row...
What is the behavior difference between return-path, reply-to and from?
...er already exists in the message, then that header is removed and replaced by the recipient's mail server.
All bounces that occur during the SMTP session should go back to the Return-Path address. Some servers may accept all email, and then queue it locally, until it has a free thread to deliver i...
How do I select a merge strategy for a git rebase?
...t rebase --strategy recursive --strategy-option theirs ${branch} as stated by the documentation)
From Git v1.7.3 Release Notes:
git rebase --strategy <s> learned the --strategy-option/-X option to pass extra options that are understood by the chosen merge strategy.
NB: "Ours" and "theirs" ...
What is a “batch”, and why is GO used?
...separate each country code into a separate transaction - which can be done by separating them on the client with go.
Some SQL statements MUST be separated by GO from the following ones in order to work.
For example, you can't drop a table and re-create the same-named table in a single transaction, ...
Search for executable files using find command
...n GNU find. In particular, -executable tests that the file can be executed by the current user, while -perm +111 just tests if any execute permissions are set.
Older versions of GNU find also support the -perm +111 syntax, but as of 4.5.12 this syntax is no longer supported. Instead, you can use -p...
What are Runtime.getRuntime().totalMemory() and freeMemory()?
...the total amount of memory in the Java virtual machine. The value returned by this method may vary over time, depending on the host environment.
Note that the amount of memory required to hold an object of any given type may be implementation-dependent.
maxMemory()
Returns the maximum amount of m...