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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...
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...
Attempt by security transparent method 'WebMatrix.WebData.PreApplicationStartCode.Start()'
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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...
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...
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
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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
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