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Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...reverse(register unsigned int x)
{
x = (((x & 0xaaaaaaaa) >> 1) | ((x & 0x55555555) << 1));
x = (((x & 0xcccccccc) >> 2) | ((x & 0x33333333) << 2));
x = (((x & 0xf0f0f0f0) >> 4) | ((x & 0x0f0f0f0f) << 4));
x = (((x & 0xf...
Checking if a string can be converted to float in Python
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How do I upgrade my ruby 1.9.2-p0 to the latest patch level using rvm?
My current version of ruby is ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.5.0] but I want to update it to the latest patch level using rvm. How can I do this?
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What does |= (ior) do in Python?
...or. See examples below.
Sets
For example, the union of two assigned sets s1 and s2 share the following equivalent expressions:
>>> s1 = s1 | s12 # 1
>>> s1 |= s2 # 2
>>> s1.__ior__(s2) ...
Remove rows with all or some NAs (missing values) in data.frame
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Indexes of all occurrences of character in a string
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How to make rpm auto install dependencies
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悬浮窗使用指导 · App Inventor 2 中文网
...，将同名事件的处理合并到一个事件积木中。
when Screen1.Initialize() {
悬浮窗1.ShowButton()
}
when 悬浮窗1.Click() {
对话框1.ShowAlert("点了悬浮按钮")
}
避开底部 Tab 栏：独立设置两个间距
设计器属性里直接设置水...
Multiple linear regression in Python
... regress my dependent variable (y) against several independent variables (x1, x2, x3, etc.).
13 Answers
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