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How can you determine a point is between two other points on a line segment?
Let's say you have a two dimensional plane with 2 points (called a and b) on it represented by an x integer and a y integer for each point.
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Convert to/from DateTime and Time in Ruby
..._time
to_time(new_offset(DateTime.now.offset-offset), :local)
end
private
def to_time(dest, method)
#Convert a fraction of a day to a number of microseconds
usec = (dest.sec_fraction * 60 * 60 * 24 * (10**6)).to_i
Time.send(method, dest.year, dest.month, dest.day, dest.hour, d...
Write a function that returns the longest palindrome in a given string
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You can find the the longest palindrome using Manacher's Algorithm in O(n) time! Its implementation can be found here and here.
For input String s = "HYTBCABADEFGHABCDEDCBAGHTFYW1234567887654321ZWETYGDE" it finds the correct output which is 123456788765...
How to throw an exception in C?
I typed this into google but only found howtos in C++,
11 Answers
11
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Retrieving parameters from a URL
Given a URL like the following, how can I parse the value of the query parameters? For example, in this case I want the value of def .
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How can I check the size of a collection within a Django template?
I have a list in my Django template. I want to do something only if the size of the list is greater than zero.
7 Answers...
Postgresql aggregate array
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Use array_agg: http://www.sqlfiddle.com/#!1/5099e/1
SELECT s.name, array_agg(g.Mark) as marks
FROM student s
LEFT JOIN Grade g ON g.Student_id = s.Id
GROUP BY s.Id
By the way, if you are using Postgres 9.1, you don't need to repeat...
Side-by-side plots with ggplot2
I would like to place two plots side by side using the ggplot2 package , i.e. do the equivalent of par(mfrow=c(1,2)) .
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Do I really need to encode '&' as '&'?
I'm using an ' & ' symbol with HTML5 and UTF-8 in my site's <title> . Google shows the ampersand fine on its SERPs, as do all the browsers in their titles.
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In what cases do I use malloc and/or new?
I see in C++ there are multiple ways to allocate and free data and I understand that when you call malloc you should call free and when you use the new operator you should pair with delete and it is a mistake to mix the two (e.g. Calling free() on something that was created with the new ...