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How does BLAS get such extreme performance?
...
A good starting point is the great book The Science of Programming Matrix Computations by Robert A. van de Geijn and Enrique S. Quintana-Ortí. They provide a free download version.
BLAS is divided into three levels:
Level 1 defin...
What does SynchronizationContext do?
...gh degree, take care of capturing the UI thread's synchronization context, starting an asynchronous operation, then getting back onto the UI thread so you can process the operation's result.
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Is there any way to call a function periodically in JavaScript?
...ask.name + ' task has run ' + task.currentRuns + ' times.');
}
});
// Start the timer
timer.start();
TaskTimer works both in browser and Node. See documentation for all features.
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How to append a char to a std::string?
...al studio 2015 as compiler and my processor is an i7, 8Hz, 2GHz.
long start = clock();
int a = 0;
//100000000
std::string ret;
for (int i = 0; i < 60000000; i++)
{
ret.append(1, ' ');
//ret += ' ';
//ret.push_back(' ');
//ret.insert(ret.end...
How to query MongoDB with “like”?
...st do a table scan, then it can certainly be expensive. If you're doing a 'starts with' regex query, then that can use an index. Best to run an explain() to see what's happening.
– Kyle Banker
Jul 22 '10 at 14:49
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Decimal number regular expression, where digit after decimal is optional
...digits (\d*).
Depending on your usage or regex engine you may need to add start/end line anchors:
/^\d+\.?\d*$/
Debuggex Demo
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What is the proper declaration of main?
... function would not be the main function that designates where the program starts.
The main function cannot be declared as static or inline. It also cannot be overloaded; there can be only one function named main in the global namespace.
The main function cannot be used in your program: you are n...
How do we use runOnUiThread in Android?
... e.printStackTrace();
}
}
}
}.start();
}
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How do I fix “Failed to sync vcpu reg” error?
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Got this issue on Mac. After turn off VBox it started to work.
– 0x8BADF00D
Feb 18 '15 at 18:24
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How to check if PHP array is associative or sequential?
...s
Secondly, how to determine whether an array has sequential numeric keys, starting from 0
Consider which of these behaviours you actually need. (It may be that either will do for your purposes.)
The first question (simply checking that all keys are numeric) is answered well by Captain kurO.
For...