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R: rJava package install failing
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I am on R 2.15.3 ubuntu 12.04.2 64bit. when I update.packages() I get i notice that there is a rJava update. Installation from within R fails. When I apt-get install r-cran-rjava there is no update available. Why is this happening?
– E...
How to create Java gradle project
...ders eclipse` or `gradle initSourceFolders idea`
* @author Paul Verest;
* based on `gradle init --type basic`, that does not create source folders
*/
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
task initSourceFolders { // add << before { to prevent executing during co...
How to properly seed random number generator
...ree that this matters to you will vary but you can avoid pitfalls of clock based seed values by simply using the crypto/rand.Read as source for your seed. It will give you that non-deterministic quality that you are probably looking for in your random numbers (even if the actual implementation itsel...
What is more efficient? Using pow to square or just multiply it with itself?
...b)
TEST(5, b*b*b*b*b)
template <int exponent>
double testpow(double base, long loops)
{
double x = 0.0;
boost::posix_time::ptime startTime = now();
for (long i=0; i<loops; ++i)
{
x += std::pow(base, exponent);
x += std::pow(base, exponent);
x += std...
How to empty a list?
...s what I needed to do. I was taking in data and wanted to create sub lists based on a condition and put the sub lists into a master list. Naturally when I would use any of the delete methods it would delete the sub list and the list I was appending in the master list. Mitenka's suggestion was exactl...
In C++, is it still bad practice to return a vector from a function?
...tors freely (and make sure your own objects support it, too). If your code base needs to support "lesser" compilers, stick to the old style.
Unfortunately, that has major influence on your interfaces. If C++ 0x is not an option, and you need guarantees, you might use instead reference-counted or c...
Map Tiling Algorithm
I'm making a tile based RPG with Javascript, using perlin noise heightmaps, then assigning a tile type based on the height of the noise.
...
Referencing system.management.automation.dll in Visual Studio
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I've installed the SDK on 2 different 64-bit machines (with difficulty) and found the version 6.2.8229.0, 4.66MB dll on only 1, and only in c:\program files (x86)\reference assemblies\microsoft\windowspowershell\v1.0. I highly recommend editing the .csproj file,...
Differences between .NET 4.0 and .NET 4.5 in High level in .NET
...ing
Asynchronously flushing a response
Support for await and Task-Based Asynchronous Modules and Handlers
differences in C# also in these frameworks
Go Through C# 4.0 - New C# Features in the .NET Framework and What's New for Visual C# in Visual Studio 11 Beta.
Edit:
The langu...
Which version of PostgreSQL am I running?
...-------------------------------------------------
PostgreSQL 9.2.9 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-4), 64-bit
=> SHOW server_version;
server_version
----------------
9.2.9
=> SHOW server_version_num;
server_version_num
------------------...