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Random Gaussian Variables
...m rand = new Random(); //reuse this if you are generating many
double u1 = 1.0-rand.NextDouble(); //uniform(0,1] random doubles
double u2 = 1.0-rand.NextDouble();
double randStdNormal = Math.Sqrt(-2.0 * Math.Log(u1)) *
Math.Sin(2.0 * Math.PI * u2); //random normal(0,1)
double randNormal...
Detect Retina Display
...also contains this property.
On an iPad running iOS3.2, scale will return 1.0 in 1x mode, and 2.0 in 2x mode -- even though we know that device does not contain a Retina display. Apple changed this behavior in iOS4.2 for the iPad: it returns 1.0 in both 1x and 2x modes. You can test this yourself i...
How to run a JAR file
...stem.out.println("Hello world");
}
}
manifest.mf:
Manifest-version: 1.0
Main-Class: Test
Note that the text file must end with a new line or carriage return.
The last line will not be parsed properly if it does not end with a
new line or carriage return.
Then run:
javac Test.java
jar cfm ...
How to define a circle shape in an Android XML drawable file?
...
This is a simple circle as a drawable in Android.
<?xml version="1.0" encoding="utf-8"?>
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<solid
android:color="#666666"/>
<size
android:width="120dp"
...
android button selector
...llowing is button_effect.xml file in drawable directory
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/numpad_button_bg_selected" android:state_selected="true"></item>
&l...
只有程序员能看懂的笑话 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...厌康熙的哪个儿子？ 答：胤?。 因为他是八阿哥。 加强版 程序员最喜欢七阿哥，因为他弟八阿哥。。。
随机函数可以帮你实现家庭和谐： Talk(){:top word(1)=”恩！”; word(2)=”好的！”;word(3)=”然后呢？”;word(4)=”有道理”;i=...
微软正式推送Win10，不满意或者不习惯可以回滚至旧版 - 资讯 - 清泛网 - 专...
微软正式推送Win10，不满意或者不习惯可以回滚至旧版今天无疑是微软新款操作系统Win10的大日子，被视作继Win7之后又一个能够带微软重回巅峰的系统作品，Win10推送全面开启，Win7、Win8用户从今日零点起就可以免费升级到Win10，...
【解决】Linux mysql如何重置root密码？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...密码，以防您忘记密码。 本教程适用于任何现代Linux发行版
1. 前言
忘记你的MySQL root密码？ 别担心，它发生在我们所有人身上。
在本教程中，我们将向您展示如何重置MySQL root密码，以防您忘记密码。 本教程适用于任何...
convert UIImage to NSData
...is example) is the compression quality
//expressed as a value from 0.0 to 1.0, where 1.0 represents
//the least compression (or best quality).
You can also put this code inside a GCD block and execute in another thread, showing an UIActivityIndicatorView during the process ...
//*code to show a...
Are class names in CSS selectors case sensitive?
... 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd">
XHTML 1.0 Strict
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
XHTML 1.0 Transitional
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "htt...