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Time complexity of Sieve of Eratosthenes algorithm
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Your n/2 + n/3 + n/5 + … n/97 is not O(n), because the number of terms is not constant. [Edit after your edit: O(n2) is too loose an upper bound.] A loose upper-bound is n(1+1/2+1/3+1/4+1/5+1/6+…1/n) (sum of reciprocals of all numbers up to n), which is...
Importing two classes with same name. How to handle?
...ould say that using two classes with the same name and a similiar function is usually not the best idea unless you can make it really clear which is which.
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How can I view the source code for a function?
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UseMethod("t") is telling you that t() is a (S3) generic function that has methods for different object classes.
The S3 method dispatch system
For S3 classes, you can use the methods function to list the methods for a particular generic f...
Why catch and rethrow an exception in C#?
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First; the way that the code in the article does it is evil. throw ex will reset the call stack in the exception to the point where this throw statement is; losing the information about where the exception actually was created.
Second, if you just catch and re-throw like that...
Java Class.cast() vs. cast operator
...avoid warnings in "generics land". I often see methods doing things like this:
@SuppressWarnings("unchecked")
<T> T doSomething() {
Object o;
// snip
return (T) o;
}
It's often best to replace it by:
<T> T doSomething(Class<T> cls) {
Object o;
// snip
re...
Why doesn't requests.get() return? What is the default timeout that requests.get() uses?
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What is the default timeout that get uses?
The default timeout is None, which means it'll wait (hang) until the connection is closed.
What happens when you pass in a timeout value?
r = requests.get(
'http://www.justdial.co...
Excel “External table is not in the expected format.”
... an Excel (xlsx) file using the code shown below. I get an "External table is not in the expected format." error unless I have the file already open in Excel. In other words, I have to open the file in Excel first before I can read if from my C# program. The xlsx file is on a share on our network. H...
Difference between the 'controller', 'link' and 'compile' functions when defining a directive
...ular homepage uses controller for one and link for another directive. What is the difference between the two?
4 Answers
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What are the best JVM settings for Eclipse? [closed]
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It is that time of year again: "eclipse.ini take 3" the settings strike back!
Eclipse Helios 3.6 and 3.6.x settings
alt text http://www.eclipse.org/home/promotions/friends-helios/helios.png
After settings for Eclipse Ganyme...
Why does integer overflow on x86 with GCC cause an infinite loop?
...f happens".
Yes, on x86 CPUs, integers usually wrap the way you expect. This is one of those exceptions. The compiler assumes you won't cause undefined behavior, and optimizes away the loop test. If you really want wraparound, pass -fwrapv to g++ or gcc when compiling; this gives you well-defined (...