大约有 45,000 项符合查询结果(耗时:0.0646秒) [XML]

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How do you easily horizontally center a using CSS? [duplicate]

...ng to horizontally center a <div> block element on a page and have it set to a minimum width. What is the simplest way to do this? I want the <div> element to be inline with rest of my page. I'll try to draw an example: ...
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Speed up the loop operation in R

I have a big performance problem in R. I wrote a function that iterates over a data.frame object. It simply adds a new column to a data.frame and accumulates something. (simple operation). The data.frame has roughly 850K rows. My PC is still working (about 10h now) and I have no idea about the...
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Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign

...returned for columns not set to AllowDBNull duplicate rows being returned with the same primary key. a mismatch in column definition (e.g. size of char fields) between the database and the dataset Try running your query natively and look at the results, if the resultset is not too large. If you've...
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Unable to launch the IIS Express Web server

I have an asp.net MVC 4 solution. When I try to open it using Visual studio 2012, I get following error: 53 Answers ...
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Where does the .gitignore file belong?

Does the .gitignore file belong in the .git folder structure somewhere or in the main source files? 8 Answers ...
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How to search contents of multiple pdf files?

...les in a directory/subdirectory? I am looking for some command line tools. It seems that grep can't search PDF files. 13 ...
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What is the source code of the “this” module doing?

If you open a Python interpreter, and type "import this", as you know, it prints: 5 Answers ...
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Where and why do I have to put the “template” and “typename” keywords?

...r can yield vastly different interpretations depending on what t means. If it's a type, then it will be a declaration of a pointer f. However if it's not a type, it will be a multiplication. So the C++ Standard says at paragraph (3/7): Some names denote types or templates. In general, whenever a...
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Git branching strategy integated with testing/QA process

Our development team has been using the GitFlow branching strategy and it has been great ! 6 Answers ...
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Getting A File's Mime Type In Java

...follow | edited Jul 26 '13 at 23:49 answered Jan 23 '12 at 14:49 ...