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二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...码有残缺还能扫出来，也就是为什么有人在二维码的中心位置加入图标。
错误修正容量
L水平
7%的字码可被修正
M水平
15%的字码可被修正
Q水平
25%的字码可被修正
H水平
30%的字码可被修正
...
How to wait for several Futures?
...lt;- func2.concurrently
f3 <- func3.concurrently
} yield for {
v1 <- f1
v2 <- f2
v3 <- f3
} yield (v1,v2,v3)
}.future
f.onFailure { case t => println("future failed $t") }
In the example above, f1,f2 and f3 will run concurrently and if any fail in any order the futu...
What is the best way to detect a mobile device?
...
100
Why not: if( screen.width <= 480 ) { // is mobile }
– andrewrjones
Jan 20 '13 at 1:05
...
How to clone all remote branches in Git?
...-a
* master
remotes/origin/HEAD
remotes/origin/master
remotes/origin/v1.0-stable
remotes/origin/experimental
If you just want to take a quick peek at an upstream branch, you can check it out directly:
$ git checkout origin/experimental
But if you want to work on that branch, you'll need to...
深入理解 x86/x64 的中断体系 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...间低端，实际上等于 ROM 被映射到地址空间最高端和低端位置。
此时在系统的内存里其实并不存在 BIOS 代码，ROM BIOS 的一部分职责是负责安装 BIOS 代码进入系统内存。
jmp far f000:e05b
典型是这条指令就是 0xFFFFFFF0 处...
App Inventor 2 能否实现后台推送通知？源码级深度调研 - App应用开发 - 清...
...App Inventor 2 现有组件源码分析
2.1 FirebaseDB 组件
源码位置：components/src/com/google/appinventor/components/runtime/FirebaseDB.java
使用库：firebase.jar（旧版 Firebase 客户端 SDK，@UsesLibraries(libraries = "firebase.jar")）
结论：使用的是 F...
创业公司倒闭大潮 教你正确烧钱速度？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...标是投资工程师团队保持产品领先、投资新办公室/地理位置(提前抢占市场)、投资市场(抢先吸引顾客)，而所有这些事经常需要在你赚钱前就大量花钱。不过如果你使用这一策略，很大程度将必须依赖下面我要讲的第3点。
资金...
Index all *except* one item in python
...at if variable is list of lists, some approaches would fail.
For example:
v1 = [[range(3)] for x in range(4)]
v2 = v1[:3]+v1[4:] # this fails
v2
For the general case, use
removed_index = 1
v1 = [[range(3)] for x in range(4)]
v2 = [x for i,x in enumerate(v1) if x!=removed_index]
v2
...
Good Java graph algorithm library? [closed]
...new SimpleGraph<String, DefaultEdge>(DefaultEdge.class);
String v1 = "v1";
String v2 = "v2";
String v3 = "v3";
String v4 = "v4";
// add the vertices
g.addVertex(v1);
g.addVertex(v2);
g.addVertex(v3);
g.addVertex(v4);
// add edges to create a circuit
...
Why is rbindlist “better” than rbind?
...
By v1.9.2, rbindlist had evolved quite a bit, implementing many features including:
Choosing the highest SEXPTYPE of columns while binding - implemented in v1.9.2 closing FR #2456 and Bug #4981.
Handling factor columns ...