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How can I create an error 404 in PHP?
...
Try this:
<?php
header("HTTP/1.0 404 Not Found");
?>
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Converting numpy dtypes to native python types
...onsistently: >>> print([numpy.asscalar(x) for x in numpy.linspace(1.0, 0.0, 21)]) [1.0, 0.95, 0.9, 0.85, 0.8, 0.75, 0.7, 0.6499999999999999, 0.6, 0.55, 0.5, 0.44999999999999996, 0.3999999999999999, 0.35, 0.29999999999999993, 0.25, 0.19999999999999996, 0.1499999999999999, 0.09999999999999998...
position: fixed doesn't work on iPad and iPhone
...viewport" content="width=device-width, height=device-height, initial-scale=1.0, user-scalable=0, minimum-scale=1.0, maximum-scale=1.0">
Also if you're planning on having the same page work on android pre 4.0, you need to set the top position also, or a small margin will be added for some reason...
wxbit平台第三方扩展报错分析：no such class 运行时错误的根本原因 - AI ...
...是 wxbit 平台的结构性问题，从三个层面解释：
1. MIT 原版的 Extension 加载流程
在 MIT 官方版（以及 fun123.cn 同步的版本）中：
- 构建服务器（BuildServer）收到 .aia 后，会解析其中的 extension .aix 文件
- 将 extension 的 Java 类打入 ...
“Too many values to unpack” Exception
...ecent call last):
File "/home/brandon/Development/DJANGO_VERSIONS/Django-1.0/django/template/debug.py", line 71, in render_node
result = node.render(context)
File "/home/brandon/Development/DJANGO_VERSIONS/Django-1.0/django/template/debug.py", line 87, in render
output = force_unicode(se...
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 ...
App Inventor 2 连接调试器的几种方式的比较 - App Inventor 2 中文网 - 清...
...拟器多少都有一些广告app，还不能删除。
桌面版AI伴侣
也是搭建一个安卓模拟器，安装AI伴侣。对电脑显卡要求高，一般电脑用不了。
即便电脑显卡支持，但是本身及AI伴侣版本都很旧，维护者几乎不更新了，这种...
How to define a circle shape in an Android XML drawable file?
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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"
...