大约有 48,000 项符合查询结果(耗时:0.0417秒) [XML]
How can I prevent the “You have mixed tabs and spaces. Fix this?” message?
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This needs to be updated for VS2017 now. As it turns out, this is its own extension that can be disabled now
– Joe Phillips
Mar 7 '17 at 16:53
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IllegalMonitorStateException on wait() call
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I know this thread is almost 2 years old but still need to close this since I also came to this Q/A session with same issue...
Please read this definition of illegalMonitorException again and again...
IllegalMonitorException i...
What is the difference between bottom-up and top-down?
...tree may be infinitely large. Furthermore, in some problems you might not know what the full tree looks like ahead of time. Thus, you might need a strategy/algorithm to decide which subproblems to reveal.)
Memoization, Tabulation
There are at least two main techniques of dynamic programming whic...
What is the difference between gsub and sub methods for Ruby Strings
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Yeah. I understand now. In my defense, I don't think this was very obvious... Until now, that is.
– Ryanmt
Jul 20 '11 at 22:50
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How can I get a count of the total number of digits in a number?
...t is still slow for Platform = x86 (I could not find the reason why, until now).
The STRING method is consistently slow: it greedily allocates too much memory for nothing. Interestingly, in .NET Core, string allocation seems to be much faster than in .NET Framework. Good to know.
The IF-CHAIN meth...
Understanding implicit in Scala
... of the reasons I stopped trying to learn Scala many years ago and am only now coming back to it. I was never sure where some (many) of the implicits were coming from in the code I was looking at.
– melston
Mar 19 '19 at 19:23
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FFmpeg on Android
I have got FFmpeg compiled (libffmpeg.so) on Android. Now I have to build either an application like RockPlayer or use existing Android multimedia framework to invoke FFmpeg.
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What to use now Google News API is deprecated? [closed]
As part of a Project I'm working on I've been instructed to implement Google News API into a Web Application.
3 Answers
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HTML table headers always visible at top of window when viewing a large table
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Could you add a fiddle with a working code? (I know that there is in the site...)
– Michel Ayres
Mar 14 '14 at 14:53
12
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Adding a column to a data.frame
...1, 1 + cumsum(nonpos))
> classes
[1] 1 1 1 1 2 2 2 2 2 2 2 3 3 3 3
Now, we can attach it back onto our data frame with cbind (by using the class= syntax, we can give the column the class heading):
> data_w_classes <- cbind(data, class=classes)
And data_w_classes now contains the re...
