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Generate random numbers using C++11 random library
...lude <random>
#include <iostream>
int main() {
std::random_device rd;
std::mt19937 mt(rd());
std::uniform_real_distribution<double> dist(1.0, 10.0);
for (int i=0; i<16; ++i)
std::cout << dist(mt) << "\n";
}
We use random_device once to see...
Mongodb Explain for Aggregation framework
...erations
explain:true
db.collection.aggregate([
{ $project : { "Tags._id" : 1 }},
{ $unwind : "$Tags" },
{ $match: {$or: [{"Tags._id":"tag1"},{"Tags._id":"tag2"}]}},
{ $group: {
_id : "$_id",
count: { $sum:1 }
}},
{$sort: {"count":-1}}
],
{
explain...
Retrieve database or any other file from the Internal Storage using run-as
... databases.tar
adb exec-out run-as debuggable.app.package.name tar c shared_prefs/ > shared_prefs.tar
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Hadoop “Unable to load native-hadoop library for your platform” warning
...entOS. The reason you saw that warning is the native Hadoop library $HADOOP_HOME/lib/native/libhadoop.so.1.0.0 was actually compiled on 32 bit.
Anyway, it's just a warning, and won't impact Hadoop's functionalities.
Here is the way if you do want to eliminate this warning, download the source cod...
Where does the .gitignore file belong?
...answered Apr 11 '18 at 12:18
XLE_22XLE_22
3,12633 gold badges1111 silver badges3737 bronze badges
...
Geometric Mean: is there a built-in?
...gth(x) is necessary for the cases where x contains non-positive values.
gm_mean = function(x, na.rm=TRUE){
exp(sum(log(x[x > 0]), na.rm=na.rm) / length(x))
}
Thanks to @ben-bolker for noting the na.rm pass-through and @Gregor for making sure it works correctly.
I think some of the comments ...
How to iterate through all git branches using bash script
...rmat='%(refname:short)'
iterate through all git branches: mapfile -t -C my_callback -c 1 < <( get_branches )
example:
my_callback () {
INDEX=${1}
BRANCH=${2}
echo "${INDEX} ${BRANCH}"
}
get_branches () {
git branch --all --format='%(refname:short)'
}
# mapfile -t -C my_callback -c 1...
What is path of JDK on Mac ? [duplicate]
Im using Mac only at work and I need to set JAVA_HOME to proper path of JDK. I downloaded JDK, installed it and now I can't find it anywhere. I was looking at the internet for the solution, but there is no folder Libraries/Java.
...
Unique Constraint in Entity Framework Code First
...
CreateIndex("TableName", new string[2] { "Column1", "Column2" }, true, "IX_UniqueColumn1AndColumn2");
Something like that:
namespace Sample.Migrations
{
using System;
using System.Data.Entity.Migrations;
public partial class TableName_SetUniqueCompositeIndex : DbMigration
{
...
Convert.ChangeType() fails on Nullable Types
...a series of blog posts including this at http://www.endswithsaurus.com/2010_07_01_archive.html (Scroll down to the Addendum, @JohnMacintyre actually spotted the bug in my original code which led me down the same path you're on now). I have a couple of small modifications since that post that includ...