大约有 710 项符合查询结果（耗时：0.0074秒） [XML]
Convert data.frame columns from factors to characters
...n Matt and Dirk. If you want to recreate your existing data frame without changing the global option, you can recreate it with an apply statement:
bob <- data.frame(lapply(bob, as.character), stringsAsFactors=FALSE)
This will convert all variables to class "character", if you want to only con...
Load multiple packages at once
How can I load a bunch of packages at once with out retyping the require command over and over? I've tried three approaches all of which crash and burn.
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Pass an array of integers to ASP.NET Web API?
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What if I don't know how much variables I have in the array? What if it's like 1000? The request shouldn't be like that.
– Sahar Ch.
May 30 '14 at 8:22
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How to test equality of Swift enums with associated values
...newer, the following will automatically synthesize the necessary methods such that XCTAssert(t1 == t2) works. The key is to add the Equatable protocol to your enum.
enum SimpleToken: Equatable {
case Name(String)
case Number(Int)
}
let t1 = SimpleToken.Number(123)
let t2 = SimpleToken.Numbe...
Android WebView: handling orientation changes
...the performance following rotation. The WebView has to reload the page, which can be a bit tedious.
20 Answers
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How to change maven logging level to display only warning and errors?
...f/logging/simplelogger.properties
According to the page : http://maven.apache.org/maven-logging.html
Command line setup
I think you should be able to setup the default Log level of the simple logger via a command line parameter, like this:
$ mvn clean package -Dorg.slf4j.simpleLogger.defaultLogLeve...
How can I extend typed Arrays in Swift?
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Update:
To extend typed arrays with non-classes use the following approach:
typealias HighScoreEntry = (Int)
extension SequenceType where Generator.Element == HighScoreEntry {
func sort() -> [HighScoreEntry] {
return sort { $0 < $1 }
}
}
In Swift 3 some types have been ren...
Why generate long serialVersionUID instead of a simple 1L?
... useful if you neglected to use a serialVersionUID before, and then made a change that you know should be compatible but which causes serialization to break.
See the Java Serialization Spec for more details.
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Drawing a dot on HTML5 canvas [duplicate]
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draw point as a line
draw point as a polygon
draw point as a circle
Each of them has their drawbacks.
Line
function point(x, y, canvas){
canvas.beginPath();
canvas.moveTo(x, y);
canvas.lineTo(x+1, y+1);
canvas.stroke();
}
Keep in mind that we are drawing to South-East direction, a...
How can I use inverse or negative wildcards when pattern matching in a unix/linux shell?
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How would you match, say, everything starting with f, except foo?
– Noldorin
Jun 21 '13 at 20:58
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