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Algorithm for creating a school timetable
I've been wondering if there are known solutions for algorithm of creating a school timetable. Basically, it's about optimizing "hour-dispersion" (both in teachers and classes case) for given class-subject-teacher associations. We can assume that we have sets of classes, lesson subjects and teacher...
Value of type 'T' cannot be converted to
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Even though it's inside of an if block, the compiler doesn't know that T is string.
Therefore, it doesn't let you cast. (For the same reason that you cannot cast DateTime to string)
You need to cast to object, (which any T can cast to), and from there to...
How to programmatically close a JFrame
What's the correct way to get a JFrame to close, the same as if the user had hit the X close button, or pressed Alt + F4 (on Windows)?
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Choose between ExecutorService's submit and ExecutorService's execute
How should I choose between ExecutorService's submit or execute , if the returned value is not my concern?
7 Answers
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How to organize large R programs?
...swer is to use packages -- see the Writing R Extensions manual as well as different tutorials on the web.
It gives you
a quasi-automatic way to organize your code by topic
strongly encourages you to write a help file, making you think about the interface
a lot of sanity checks via R CMD check
a ...
MySQL Error 1093 - Can't specify target table for update in FROM clause
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Update: This answer covers the general error classification. For a more specific answer about how to best handle the OP's exact query, please see other answers to this question
In MySQL, you can't modify the same table which you use in the SELECT part.
This behaviour is doc...
What is a “first chance exception”?
...ions are thrown to the debugger first and then to the actual program where if it isn't handled it gets thrown to the debugger a second time, giving you a chance to do something with it in your IDE before and after the application itself. This appears to be a Microsoft Visual Studio invention.
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How to wait for all goroutines to finish without using time.Sleep?
... Nice to see a solution with plain channels. An added bonus: if doSomething() returns some result, than you can put that on the channel, and you can collect and process the results in the second for loop (as soon as they are ready)
– andras
Aug 13...
How to show loading spinner in jQuery?
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too global? how many different "please wait" messages do you want?
– nickf
Aug 1 '09 at 17:59
23
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What is the type of lambda when deduced with “auto” in C++11?
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The type of a lambda expression is unspecified.
But they are generally mere syntactic sugar for functors. A lambda is translated directly into a functor. Anything inside the [] are turned into constructor parameters and members of the functor object, and the param...