大约有 40,000 项符合查询结果（耗时：0.0497秒） [XML]
How to plot two histograms together in R?
... you've been reading on ggplot then maybe the only thing you're missing is combining your two data frames into one long one.
So, let's start with something like what you have, two separate sets of data and combine them.
carrots <- data.frame(length = rnorm(100000, 6, 2))
cukes <- data.frame(...
Can someone copyright a SQL query? [closed]
...ort a list of students from our student management system and send it to a company that handles our online exams.
72 Answer...
What is Scala's yield?
...
It is used in sequence comprehensions (like Python's list-comprehensions and generators, where you may use yield too).
It is applied in combination with for and writes a new element into the resulting sequence.
Simple example (from scala-lang)
/...
How to have stored properties in Swift, the same way I had on Objective-C?
...
|
show 3 more comments
184
...
Why is there no multiple inheritance in Java, but implementing multiple interfaces is allowed?
...ss, you have to override this method in the class itself, see: docs.oracle.com/javase/tutorial/java/IandI/…
– bobbel
May 14 '14 at 12:29
7
...
What is the standard Python docstring format? [closed]
...rmation about the main formats in this blog post.
Note that the reST is recommended by the PEP 287
There follows the main used formats for docstrings.
- Epytext
Historically a javadoc like style was prevalent, so it was taken as a base for Epydoc (with the called Epytext format) to generate docu...
What is the difference between `new Object()` and object literal notation?
...
The author chose this answer as correct, but it is incomplete. Be aware there are differences between the two syntaxes when you get into memory allocation.
– newshorts
May 20 '15 at 0:29
...
Do browsers parse javascript on every page load?
...VM, this isn't really the case with the modern interpreters, which tend to compile the source directly into machine code (with the exception of IE).
Chrome : V8 Engine
V8 has a compilation cache. This stores compiled JavaScript using a hash of the source for up to 5 garbage collections. This mea...
What exactly do “u” and “r” string flags do, and what are raw string literals?
...ich a backslash, \, is taken as meaning "just a backslash" (except when it comes right before a quote that would otherwise terminate the literal) -- no "escape sequences" to represent newlines, tabs, backspaces, form-feeds, and so on. In normal string literals, each backslash must be doubled up to ...
Is the practice of returning a C++ reference variable evil?
...rn 0;
}
If the lifetime should be left up to the caller, and you're just computing the value.
Summary: it's okay to return a reference if the lifetime of the object won't end after the call.
share
|
...