大约有 43,000 项符合查询结果（耗时：0.0663秒） [XML]
List distinct values in a vector in R
...
You can also use the sqldf package in R.
Z <- sqldf('SELECT DISTINCT tablename.columnname FROM tablename ')
share
|
improve this answer
|
follow
...
How can I expand and collapse a using javascript?
... I will get rid of it and just use a border. This is excellent because it selects the div to expand relative to the header I've clicked, which is important because of the fact that I may have several different numbers of listed items depending on user settings and other factors.
...
remove legend title in ggplot
...
Since you may have more than one legends in a plot, a way to selectively remove just one of the titles without leaving an empty space is to set the name argument of the scale_ function to NULL, i.e.
scale_fill_discrete(name = NULL)
(kudos to @pascal for a comment on another thread)
...
How to initialize/instantiate a custom UIView class with a XIB file in Swift
...
This is a better solution than the selected answer as there is no need for casting and it will also be reusable across any other UIView subclasses you create in the future.
– user3344977
Nov 1 '15 at 21:23
...
What is the difference between Xamarin.Form's LayoutOptions, especially Fill and Expand?
...zontal and vertical options for the Entry and changed the text to show the selected options, so you can see how the Entry moves and resizes.
Here is the code used for Start:
<Label Text="Vert: Start, Horz: Start" VerticalOptions="Start" HorizontalOptions="Start" BackgroundColor="White"/>
And...
What is __init__.py for?
...ll fail.
The __init__.py file is usually empty, but can be used to export selected portions of the package under more convenient name, hold convenience functions, etc.
Given the example above, the contents of the init module can be accessed as
import spam
based on this
...
Can PHP cURL retrieve response headers AND body in a single request?
...
Take a look to the selected answer of stackoverflow.com/questions/14459704/… before implementing something like this. w3.org/Protocols/rfc2616/rfc2616-sec14.html (14.20) A server that does not understand or is unable to comply with any of t...
How do I create/edit a Manifest file?
... to your project.
Right click your project file on the Solution Explorer, select Add, then New item (or CTRL+SHIFT+A). There you can find Application Manifest File.
The file name is app.manifest.
share
|
...
Placing border inside of div and not on its edge
...div>
Using ::after you are styling the virtual last child of the selected element. content property creates an anonymous replaced element.
We are containing the pseudo element using absolute position relative to the parent. Then you have freedom to have whatever custom background and/or b...
How can I get selector from jQuery object
Is there an easy way to get selector from $(this) ? There is a way to select an element by its selector, but what about getting the selector from element ?
...