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Is R's apply family more than syntactic sugar?
...antial, like when you have to nest for-loops to get the average based on a grouping of more than one factor. Here you have two approaches that give you the exact same result :
set.seed(1) #for reproducability of the results
# The data
X <- rnorm(100000)
Y <- as.factor(sample(letters[1:5],10...
Non-Relational Database Design [closed]
... In the thread Data Design in Non-Relational Databases of the NOSQL Google group the different paradigms are categorized like this:
Bigtable-like systems (HBase,
Hypertable, etc)
Key-value stores (Tokyo, Voldemort,
etc)
Document databases (CouchDB,
MongoDB, etc)
Graph databases (AllegroGraph,
Neo4...
How does LMAX's disruptor pattern work?
...rom ConsumerCallId to received in changeId can be consumed in batch.
If a group of consumers read together (the ones with shared id generator), each one only takes a single callId, and only the slot for that single callId is checked and returned.
...
Named colors in matplotlib
...w of the available colors from the posted image. I prefer the colors to be grouped with similar colors, so I slightly tweaked the matplotlib answer that was mentioned in a comment above to get a color list sorted in columns. The order is not identical to how I would sort by eye, but I think it gives...
Can Protractor and Karma be used together?
...dencies come from.
Karma is just as useful for Integration Tests, where a group of source code units is tested together, with only some of their dependencies being mocked. It is important to remember that any dependency is by default provided from your source code modules (as long as those modules ...
VC MFC工具栏(CToolBar)控件 - C/C++ - 清泛网 - 专注C/C++及内核技术
...则处于按下状态时有一种不同的背景颜色。
· TBSTYLE_CHECKGROUP 创建一个核选按钮，它被选择后一直处于按下状态，直到同组中的另一个按钮被按下时它才弹起。
· TBSTYLE_GROUP 创建一个被选择后一直处于按下状态，直到同组中的...
How much of a git sha is *generally* considered necessary to uniquely identify a change in a given c
...Wikipedia).
It is about the probability of having 2 (or more) people from group of N people to have birthday on the same day in year. Which is analogical to probabily of 2 (or more) git commits from repository having N commits in total having the same hash prefix of length X.
Look at the Probabili...
xUnit.net: Global setup + teardown?
...ve developers a wide range of setup/teardown functionality at the class or group of classes level. This is in line with the answer from Geir Sagberg, and gives good skeleton implementation to illustrate what it should look like.
https://xunit.github.io/docs/shared-context.html
Collection Fixt...
How to read the output from git diff?
..., and Read permission) and corresponds in that order to Owner (User), then Group, then Other permissions. So in short 644 would mean if written symbolicaly u=rw,og=r, that is readable to everyone but writable only by owner. The other digits on the left encode other information, like if it is a symli...
What XML parser should I use in C++? [closed]
...ings are meaningful). Perhaps one can look at the W3C data binding working group that lists several data binding tools which are in the public domain and were used for testing and reporting (full disclosure: I am not affiliated with CodeSynthesis, I've helped gsoap listed with the W3C tools).
...