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Why is rbindlist “better” than rbind?
...Try DF = data.frame(a=1:3); .Internal(inspect(DF)); tracemem(DF); attr(DF,"test") <- "hello"; .Internal(inspect(DF)).
– Matt Dowle
Mar 28 '13 at 13:38
4
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How do I discover memory usage of my application in Android?
...d memory in a graph, and garbage collection
events over time.
Quickly testing whether app slowness might be
related to excessive garbage collection events.
Quickly testing
whether app crashes may be related to running out of memory.
Figure 1. Forcing a GC (Garbage Collection) even...
Why do we need a pure virtual destructor in C++?
...ng of base class without making any change in your already implemented and tested derive class, you implement a pure virtual destructor in your base class.
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C# Sortable collection which allows duplicate keys
..., b) => a.Item1.CompareTo(b.Item1);
base.Sort(c);
}
}
My test case:
[TestMethod()]
public void SortTest()
{
TupleList<int, string> list = new TupleList<int, string>();
list.Add(1, "cat");
list.Add(1, "car");
list.Add(2, "dog");
...
MySQL foreign key constraints, cascade delete
...
I got confused by the answer to this question, so I created a test case in MySQL, hope this helps
-- Schema
CREATE TABLE T1 (
`ID` int not null auto_increment,
`Label` varchar(50),
primary key (`ID`)
);
CREATE TABLE T2 (
`ID` int not null auto_increment,
`Label` va...
What are the relative strengths and weaknesses of Git, Mercurial, and Bazaar? [closed]
...make heavy use of precommit script automation with SVN (ie. requiring unit tests to pass before a commit can proceed), you'll probably want to use a tool similar to PQM for automating merge requests to your shared branches.
SVK is a DSCM which uses Subversion as its backing store, and has quite goo...
system(“pause”); - Why is it wrong?
...
Sometimes an Ungood Practice™ is needed for quick tests.... what we call "quick and dirty"
– Michael Haephrati
Jan 11 '18 at 19:04
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Is it possible to install another version of Python to Virtualenv?
...ct.py
[...repeat until all symbolic links are relative...]
$ cd ../../../
Test
$ python --version
Python 2.7.1
$ source env/bin/activate
(env)
$ python --version
Python 2.7.3
Aloha.
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MySQL: multiple tables or one table with many columns?
...r 139 from storage engine" all the time. So we had to split the table. (We tested with the newer Barracuda format and it worked without splitting, but our client's servers still use MySQL 5.0).
– MV.
Dec 13 '12 at 7:05
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When to use MongoDB or other document oriented database systems? [closed]
...ven’t used MongoDB in production, but I have used it a little building a test app and it is a very cool piece of kit. It seems to be very performant and either has, or will have soon, fault tolerance and auto-sharding (aka it will scale). I think Mongo might be the closest thing to a RDBMS replace...