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How do I determine k when using k-means clustering?
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Basically, you want to find a balance between two variables: the number of clusters (k) and the average variance of the clusters. You want to minimize the former while also minimizing the latter. Of course, as the number of clus...
Ruby on Rails Server options [closed]
...ances, each serving the same Ruby app. This set of app server processes is called an app server cluster (hence the name Mongrel Cluster, Thin Cluster, etc). You must then setup Apache or Nginx to reverse proxy to this cluster. Apache/Nginx will take care of distributing requests between the instance...
How do I correctly detect orientation change using Phonegap on iOS?
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@HellBaby When the keyboard appears the function will get called, however, depending on what method you use for orientation detection, it will detect that the orientation HAS NOT CHANGED, as would be the case with window.orientation. So I still stand by my answer.
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How to check if a number is a power of 2
... for the sake of simplicity assume that someone has passed the value 4 and called the function like so:
bool b = IsPowerOfTwo(4)
Now we replace each occurrence of x with 4:
return (4 != 0) && ((4 & (4-1)) == 0);
Well we already know that 4 != 0 evals to true, so far so good. But w...
How to flatten an ExpandoObject returned via JsonResult in asp.net mvc?
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My serializer gets called recursively. If I set RecursionLimit, I either get recursion limit exceeded error or stack overflow exception error. What should I do? :(
– Dhanashree
Jul 25 '17 at 13:47
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Get table column names in MySQL?
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+1 I wanted to select table names where a column exist I did SELECT TABLE_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'db_name' AND COLUMN_NAME = 'col_name';
– AL̲̳I
May 22 '14 at 10:01
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Can we have functions inside functions in C++?
...orm of a lambda:
int main() {
// This declares a lambda, which can be called just like a function
auto print_message = [](std::string message)
{
std::cout << message << "\n";
};
// Prints "Hello!" 10 times
for(int i = 0; i < 10; i++) {
prin...
Catch multiple exceptions in one line (except block)
...r way is to create method which performs task executed by except block and call it through all of the except block that you write..
try:
You do your operations here;
......................
except Exception1:
functionname(parameterList)
except Exception2:
functionname(parameterList)
ex...
Is Javascript a Functional Programming Language?
...re are closures, and higher order functions, does Javascript deserve to be called a Functional Programming language? The main thing I think it lacks is Pure Functions, and it doesn't 'feel' like other functional languages, like lisp (although thats not really a good reason for it not to be a functi...
How to specify new GCC path for CMake
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Do not overwrite CMAKE_C_COMPILER, but export CC (and CXX) before calling cmake:
export CC=/usr/local/bin/gcc
export CXX=/usr/local/bin/g++
cmake /path/to/your/project
make
The export only needs to be done once, the first time you configure the project, then those values will be read fro...