大约有 30,000 项符合查询结果(耗时:0.0450秒) [XML]

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“Cloning” row or column vectors

Sometimes it is useful to "clone" a row or column vector to a matrix. By cloning I mean converting a row vector such as 9 A...
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ERROR 2006 (HY000): MySQL server has gone away

I get this error when I try to source a large SQL file (a big INSERT query). 20 Answers ...
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Installing in Homebrew errors

...ng to Mavericks, and this page was the top search result when googling the error message. I continued searching and found this answer on stack overflow.com. Put concisely, it is: sudo chmod a+w /usr/local/Cellar This fixed the issue for me, and as it only changes permissions for the specific pa...
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Attempt by security transparent method 'WebMatrix.WebData.PreApplicationStartCode.Start()'

... For me this error was because I did NOT have Microsoft.AspNet.WebHelpers installed after updating from MVC 4 to MVC 5. It was fixed by installing the NuGet package Install-Package -Id Microsoft.AspNet.WebHelpers ...
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What is the Scala annotation to ensure a tail recursive function is optimized?

...eption("bang!") | else bang(x-1) | } | } <console>:9: error: could not optimize @tailrec annotated method: it contains a recursive call not in tail position @tailrec def boom(x: Int): Int = { ^ <console>:13: error: could not optimize @tailrec ann...
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How to log source file name and line number in Python

...ger.info("This is an info log") logger.critical("This is critical") logger.error("An error occurred") Generates this output: 2017-06-06:17:07:02,158 DEBUG [log.py:11] This is a debug log 2017-06-06:17:07:02,158 INFO [log.py:12] This is an info log 2017-06-06:17:07:02,158 CRITICAL [log.py:1...
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How to get a specific “commit” of a gem from github?

I'm using rails_admin , and since it is in (very) active development, bugs turn up every now and then. 2 Answers ...
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Validation failed for one or more entities. See 'EntityValidationErrors' property for more details [

I am having this error when seeding my database with code first approach. 29 Answers 2...
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Delete all local changesets and revert to tree

I'm using Mercurial and I've got into a terrible mess locally, with three heads. I can't push, and I just want to delete all my local changes and commits and start again with totally clean code and a clean history. ...
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System.MissingMethodException: Method not found?

What once was working in my asp.net webforms app now throws this error: 34 Answers 34 ...