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Split a vector into chunks in R
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326
A one-liner splitting d into chunks of size 20:
split(d, ceiling(seq_along(d)/20))
More det...
Git Tag list, display commit sha1 hashes
...it show-ref --tags
The output will then look something like:
0e76920bea4381cfc676825f3143fdd5fcf8c21f refs/tags/1.0.0
5ce9639ead3a54bd1cc062963804e5bcfcfe1e83 refs/tags/1.1.0
591eceaf92f99f69ea402c4ca639605e60963ee6 refs/tags/1.2.0
40414f41d0fb89f7a0d2f17736a906943c05acc9 refs/tags/1.3.0
Each l...
Setup a Git server with msysgit on Windows [closed]
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answered Oct 1 '09 at 13:31
TimTim
2,36611 gold badge1919 silver badges1818 bronze badges
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(Deep) copying an array using jQuery [duplicate]
...pying, it is not suitable for multidimensional arrays:
var a =[[1], [2], [3]];
var b = a.slice();
b.shift().shift();
// a is now [[], [2], [3]]
Note that although I've used shift().shift() above, the point is just that b[0][0] contains a pointer to a[0][0] rather than a value.
Likewise delete...
阿里的线下野心 - 资讯 - 清泛网 - 专注C/C++及内核技术
...阿里在做了两年铺垫后开始向线下更深处“伸手”。
2013年“双11”前夕，阿里和银泰宣布开启O2O破冰之旅，银泰商业投入线下35个实体店的资源支持天猫“双11”。从当时情况来看，双方的合作停留于浅层次的营销手法上，并没...
How to randomize (or permute) a dataframe rowwise and columnwise?
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234
Given the R data.frame:
> df1
a b c
1 1 1 0
2 1 0 0
3 0 1 0
4 0 0 0
Shuffle row-wise:
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How to show first commit by 'git log'?
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317
Short answer
git rev-list --max-parents=0 HEAD
(from tiho's comment. As Chris Johnsen notic...
How to automatically convert strongly typed enum into int?
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138
Strongly typed enums aiming to solve multiple problems and not only scoping problem as you ment...
How to printf “unsigned long” in C?
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ThanatosThanatos
36.1k1212 gold badges7272 silver badges132132 bronze badges
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新手程序员应该知道的7件事 - 创意 - 清泛网 - 专注C/C++及内核技术
...的实用程序真的很重要。这是我经历过的切身体会。”
3、调试器是我们的好朋友
程序员很大一部分时间会涉及追踪bug。Dave Varon，Novartis公司的一位生物信息学开发人员，着重强调了调试器的优点以及它是如何减轻了时间的初...