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How can I list all collections in the MongoDB shell?
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1178
You can do...
JavaScript (shell):
db.getCollectionNames()
Node.js:
db.listCollections()
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How to succinctly write a formula with many variables from a data frame?
...in a formula to mean all the variables, it is the . identifier.
y <- c(1,4,6)
d <- data.frame(y = y, x1 = c(4,-1,3), x2 = c(3,9,8), x3 = c(4,-4,-2))
mod <- lm(y ~ ., data = d)
You can also do things like this, to use all variables but one (in this case x3 is excluded):
mod <- lm(y ~ ...
Java generics T vs Object
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115
Isolated from context - no difference. On both t and obj you can invoke only the methods of Ob...
IntelliJ does not show project folders
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391
So after asking another question, someone helped me figure out that under File > Project Stru...
How to hide element using Twitter Bootstrap and show it using jQuery?
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21 Answers
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Active
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Example for boost shared_mutex (multiple reads/one write)?
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103
It looks like you would do something like this:
boost::shared_mutex _access;
void reader()
{
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How to watch for a route change in AngularJS?
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331
Note: This is a proper answer for a legacy version of AngularJS. See this question for updated v...
Very large matrices using Python and NumPy
...t I've found that it's capable of handling matrices which are quite large (10000 x 10000) easily, but begins to struggle with anything much larger (trying to create a matrix of 50000 x 50000 fails). Obviously, this is because of the massive memory requirements.
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C/C++中退出线程的几种方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...程的几种方法想要终止线程的运行，可以使用以下方法：1、线程函数返回（最好使用该方法）。2、通过调用ExitThread函数，线程将自行撤消（最好不使用该方...想要终止线程的运行，可以使用以下方法：
1、线程函数返回（最...