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Is log(n!) = Θ(n·log(n))?
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This is a very nice proof for the upper bound: log(n!) = log(1) + ... + log(n) <= n log(n) => log(n!) = O(n log n). However, for proving the lower bound (and consequently big-tetha), you'll probably need Stirling's Approximation.
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Android - Activity vs FragmentActivity? [duplicate]
I am new in Android. I want to build an app with tab format. I found many documentation where Activity has been used. Also in many cases have used FragmentActivity . I am not sure which will be better to start. Please suggest me should I use Activity or FragmentActivity to start development i...
log4net argument to LogManager.GetLogger
Why do most log4net examples get the logger for a class by doing this:
5 Answers
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Add querystring parameters to link_to
...dding querystring parameters to link_to UrlHelper. I have an Index view, for example, that has UI elements for sorting, filtering, and pagination (via will_paginate). The will_paginate plugin manages the intra-page persistence of querystring parameters correctly.
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Are HTML Image Maps still used?
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my major issue with image maps is that unlike the images they associate with they do not scale to browser or screen size. I would hope the OP researches SVG formats
– Martin
Feb 18 '15 at 12:0...
SQL join on multiple columns in same tables
... answered May 16 '13 at 21:19
Zoran HorvatZoran Horvat
8,93933 gold badges2525 silver badges3939 bronze badges
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UIView's frame, bounds, center, origin, when to use what?
UIView has the properties frame , bounds , center , and origin , and they all seem to be interrelated. Most of the time, I deal with frame when setting the position and size of a UIView . I understand that frame is using global coordinate system and bounds is using coordinate of the lo...
Why is it bad practice to call System.gc()?
After answering a question about how to force-free objects in Java (the guy was clearing a 1.5GB HashMap) with System.gc() , I was told it's bad practice to call System.gc() manually, but the comments were not entirely convincing. In addition, no one seemed to dare to upvote, nor downvote my ...
Why can't I call read() twice on an open file?
For an exercise I'm doing, I'm trying to read the contents of a given file twice using the read() method. Strangely, when I call it the second time, it doesn't seem to return the file content as a string?
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make arrayList.toArray() return more specific types
So, normally ArrayList.toArray() would return a type of Object[] ....but supposed it's an
Arraylist of object Custom , how do I make toArray() to return a type of Custom[] rather than Object[] ?
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