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Lock, mutex, semaphore… what's the difference?
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A lock allows only one thread to enter the part that's locked and the lock is not shared with any other processes.
A mutex is the same as a lock but it can be system wide (shared by multiple processes).
A semaphore does the same as a mutex but allows x number of threads to enter, this...
git: abort commit in the middle of typing message
.... If you previously saved the file to its original path, delete everything and write the empty file first (an empty commit message will abort the commit).
Now, when you're ready to commit "for reals", use the message file you saved at the alternate path.
Alternately, copy the commit message into o...
Unable to generate an explicit migration in entity framework
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It tells you that there is some unprocessed migration in your application and it requires running Update-Database before you can add another migration.
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Most efficient method to groupby on an array of objects
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Here is one that outputs array and not object: groupByArray(xs, key) { return xs.reduce(function (rv, x) { let v = key instanceof Function ? key(x) : x[key]; let el = rv.find((r) => r && r.key === v); ...
Disable mouse scroll wheel zoom on embedded Google Maps
...st solution to this problem yet! We been facing this issue for a long time and this makes for a nice and pretty clean reusable fix!
– Diego Paladino
Aug 5 '14 at 5:47
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What does |= (single pipe equal) and &=(single ampersand equal) mean
...gnment operators, translating (very loosely)
x |= y;
into
x = x | y;
and the same for &. There's a bit more detail in a few cases regarding an implicit cast, and the target variable is only evaluated once, but that's basically the gist of it.
In terms of the non-compound operators, & ...
Rotating a two-dimensional array in Python
... answered Dec 7 '11 at 19:43
Andrew ClarkAndrew Clark
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sed or awk: delete n lines following a pattern
How would I mix patterns and numeric ranges in sed (or any similar tool - awk for example)? What I want to do is match certain lines in a file, and delete the next n lines before proceeding, and I want to do that as part of a pipeline.
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Why must a nonlinear activation function be used in a backpropagation neural network? [closed]
I've been reading some things on neural networks and I understand the general principle of a single layer neural network. I understand the need for aditional layers, but why are nonlinear activation functions used?
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Run R script from command line
...te that when using R CMD BATCH a.R that instead of redirecting output to standard out and displaying on the terminal a new file called a.Rout will be created.
R CMD BATCH a.R
# Check the output
cat a.Rout
One other thing to note about using Rscript is that it doesn't load the methods package by d...