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What are the details of “Objective-C Literals” mentioned in the Xcode 4.4 release notes?
...ew ObjC literals were discussed in multiple WWDC 2012 sessions. I intentionally didn't remove the the filenames and the time of each slide so you can find them for yourself if you feel like. They are essentially the same thing as stated in this post, but there are also a few new things that I'll me...
Is it possible to use “/” in a filename?
...hould ever be done, but is there a way to use the slash character that normally separates directories within a filename in Linux?
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Git: How to remove file from historical commit?
... have commit with id 56f06019 (for example). In that commit i have accidentally commited large file (50Mb). In another commit i add the same file but in the right size (small). Now my repo when i clone is too heavy :( How to remove that large file from repo history to reduce the size of my repo ?
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海量数据相似度计算之simhash和海明距离 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...似不相似。两个simhash对应二进制（01串）取值不同的数量称为这两个simhash的海明距离。举例如下： 10101 和 00110 从第一位开始依次有第一位、第四、第五位不同，则海明距离为3。对于二进制字符串的a和b，海明距离为等于在a XOR ...
Java 8: performance of Streams vs Collections
I'm new to Java 8. I still don't know the API in depth, but I've made a small informal benchmark to compare the performance of the new Streams API vs the good old Collections.
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Apache Spark: map vs mapPartitions?
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I'm seeing the opposite -- even with very small operations, its faster to call mapPartitions and iterate than call map. I am assuming that this is just the overhead of starting the language engine that will process the map task. (I'm in R, which may have more startup...
Can dplyr package be used for conditional mutating?
...and the conditions (except for the default value of NA at the end) are mutually exclusive, as is the case in the question, then we can use an arithmetic expression such that each term is multiplied by the desired result using na_if at the end to replace 0 with NA.
df %>%
mutate(g = 2 * (a == 2 ...
从网购到火车票，对比淘宝12306网为何如此烂？ - 大数据 & AI - 清泛网 - ...
...对12306的骂战中一战成名，由于观点相似，caoz和Fenng可以称为统一战线——当然，众多对12306充满怨恨的普通购票者也与他们在感情上统一战线。
简单分析一下12306的购票系统，为避免“黄牛”买票，购票系统有一个业务逻辑：...
How do I list all cron jobs for all users?
Is there a command or an existing script that will let me view all of a *NIX system's scheduled cron jobs at once? I'd like it to include all of the user crontabs, as well as /etc/crontab , and whatever's in /etc/cron.d . It would also be nice to see the specific commands run by run-parts in /e...
LinkedIn联合创始人：初创企业早期别花钱买用户 - 资讯 - 清泛网 - 专注C/C...
...很少收获的话，你是无法生存的。这个概念是今天被我们称为“增长黑客”的说法的基础。
“增长黑客”倡导的是通过少量的投入来获取利润。它的成本投入非常少，但是为了实现很大的用户规模，还是需要我们(运营和产品的...