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Abusing the algebra of algebraic data types - why does this work?
...oint strikingly. You mentioned in a comment that for a tree type T = 1 + T^2 you can derive the identity T^6 = 1, which is clearly wrong. However, T^7 = T does hold, and a bijection between trees and seven-tuples of trees can be constructed directly, cf. Andreas Blass's "Seven Trees in One".
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Center a DIV horizontally and vertically [duplicate]
...it here working: http://jsbin.com/iquviq/30/edit
.content {
width: 200px;
height: 600px;
background-color: blue;
position: absolute; /*Can also be `fixed`*/
left: 0;
right: 0;
top: 0;
bottom: 0;
margin: auto;
/*Solves a ...
Compare two Byte Arrays? (Java)
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In your example, you have:
if (new BigInteger("1111000011110001", 2).toByteArray() == array)
When dealing with objects, == in java compares reference values. You're checking to see if the reference to the array returned by toByteArray() is the same as the reference held in array, which of...
How to remove multiple indexes from a list at the same time? [duplicate]
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240
You need to do this in a loop, there is no built-in operation to remove a number of indexes at...
How to filter rows in pandas by regex
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200
Use contains instead:
In [10]: df.b.str.contains('^f')
Out[10]:
0 False
1 True
2 ...
How to diff a commit with its parent?
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answered Jan 12 '09 at 18:06
mipadimipadi
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Split large string in n-size chunks in JavaScript
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How can I repeat a character in Bash?
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32 Answers
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MongoDB副本集详解 优于以往的主从模式 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...b.org/downloads
实验环境使用的Mongodb版本为mongodb-linux-x86_64-2.6.0
由三台虚拟机搭建，配置为单核,1G内存。实验环境如下:
MongoDB的副本集不同于以往的主从模式。
在集群Master故障的时候，副本集可以自动投票，选举出新的Master，...
Rotating x axis labels in R for barplot
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labs <- paste(names(table(mtcars$cyl)), "cylinders")
text(cex=1, x=x-.25, y=-1.25, labs, xpd=TRUE, srt=45)
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