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Where can I learn how to write C code to speed up slow R functions? [closed]

...for learning how to write C code for use with R? I know about the system and foreign language interfaces section of R extensions, but I find it pretty hard going. What are good resources (both online and offline) for writing C code for use with R? ...
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Why would a JavaScript variable start with a dollar sign? [duplicate]

... dom object itself I find this to be very helpful in writing jQuery code and makes it easy to see jQuery objects which have a different set of properties. share | improve this answer | ...
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Shards and replicas in Elasticsearch

I am trying to understand what shard and replica is in Elasticsearch, but I didn't manage to understand it. If I download Elasticsearch and run the script, then from what I know I have started a cluster with a single node. Now this node (my PC) have 5 shards (?) and some replicas (?). ...
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How to build for armv6 and armv7 architectures with iOS 5

In iOS5 Apple drops the armv6 architecture from the ARCHS_STANDARD_32_BIT . 6 Answers ...
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Difference between acceptance test and functional test?

What is the real difference between acceptance tests and functional tests? 11 Answers ...
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Chrome's remote debugging (USB debugging) not working for Samsung Galaxy S3 running android 4.3

Ever since I upgraded my Samsung Galaxy S3 to android 4.3 (from 4.1.2) I am unable to use Chrome's remote debugging for android (more details here ). ...
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Difference between Hashing a Password and Encrypting it

... (well, a mapping). It's irreversible, you apply the secure hash algorithm and you cannot get the original string back. The most you can do is to generate what's called "a collision", that is, finding a different string that provides the same hash. Cryptographically secure hash algorithms are design...
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HTML: Include, or exclude, optional closing tags?

...unless I have a very good reason not to) because it lends to more readable and updateable code. share | improve this answer | follow | ...
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What is “runtime”?

...fers to any library, framework, or platform that your code runs on. The C and C++ runtimes are collections of functions. The .NET runtime contains an intermediate language interpreter, a garbage collector, and more. share ...
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How to make a SIMPLE C++ Makefile

...note is that root-config is a utility which provides the right compilation and linking flags; and the right libraries for building applications against root. That's just a detail related to the original audience for this document. Make Me Baby or You Never Forget The First Time You Got Made An in...