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Speed up the loop operation in R
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438
Biggest problem and root of ineffectiveness is indexing data.frame, I mean all this lines where...
Checking if a variable is an integer
Does Rails 3 or Ruby have a built-in way to check if a variable is an integer?
11 Answers
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Is log(n!) = Θ(n·log(n))?
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307
Remember that
log(n!) = log(1) + log(2) + ... + log(n-1) + log(n)
You can get the upper bo...
ESP8285接入App Inventor 2深度调研：4种连接方案+是否需要开发拓展 - 创客...
...连接方案与拓展评估
本文基于MIT App Inventor源码、fun123自研拓展源码、以及ESP8285官方数据手册，深度调研ESP8285芯片接入App Inventor 2的所有可行路径。
一、ESP8285芯片概述
ESP8285是乐鑫(Espressif)推出的WiFi SoC，本质是ESP8266的&qu...
Collisions when generating UUIDs in JavaScript?
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35
My best guess is that Math.random() is broken on your system for some reason (bizarre as that s...
Is there a way to check if int is legal enum in C#?
... None = 0, Dog = 1, Cat = 2, Rodent = 4, Bird = 8, Reptile = 16, Other = 32
};
public class Example
{
public static void Main()
{
object value;
// Call IsDefined with underlying integral value of member.
value = 1;
Console.WriteLine("{0}: {1}", value, Enum.IsDef...
sphinx-build fail - autodoc can't import/find module
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edited May 9 '12 at 19:32
answered Apr 27 '12 at 13:59
b...
Get nth character of a string in Swift programming language
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573
Attention: Please see Leo Dabus' answer for a proper implementation for Swift 4 and Swift 5.
Sw...
Class JavaLaunchHelper is implemented in both … libinstrument.dylib. One of the two will be used. Wh
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edited Sep 21 at 9:30
muttonUp
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answered A...
How can I tell if a library was compiled with -g?
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edited Nov 3 '17 at 11:09
Vadim Kotov
6,58788 gold badges4343 silver badges5555 bronze badges
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