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Generate a random double in a range
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This question was asked before Java 7 release but now, there is another possible way using Java 7 (and above) API:
double random = ThreadLocalRandom.current().nextDouble(min, max);
nextDouble will return a pseudorandom double value between the minimum (inclusive) and the ...
Converting from IEnumerable to List [duplicate]
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I wonder if Microsoft changed this. I just tried this very example, and there is no ToList() method in IEnumerable. Using VS 2015 and .NET 4.6.1 .
– James
Dec 22 '16 at 20:20
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How do you delete an ActiveRecord object?
...out a primary key
Note: from @hammady's comment, user.destroy won't work if User model has no primary key.
Note 2: From @pavel-chuchuva's comment, destroy_all with conditions and delete_all with conditions has been deprecated in Rails 5.1 - see guides.rubyonrails.org/5_1_release_notes.html
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How to abandon a hg merge?
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BTW: if you just revert the merge you did and 3 is not your revision number you can do this:
hg update -C -r .
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How does StartCoroutine / yield return pattern really work in Unity?
I understand the principle of coroutines. I know how to get the standard StartCoroutine / yield return pattern to work in C# in Unity, e.g. invoke a method returning IEnumerator via StartCoroutine and in that method do something, do yield return new WaitForSeconds(1); to wait a second, th...
How to check if running in Cygwin, Mac or Linux?
...that is used both on Windows/Cygwin and Mac and Linux. It needs slightly different variables for each versions.
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If a DOM Element is removed, are its listeners also removed from memory?
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Older browsers
Older browsers - specifically older versions of IE - are known to have memory leak issues due to event listeners keeping hold of references to the elements they were attached to.
If you want a more in-depth explanation of the causes, patterns and solutions used to fix legacy IE ve...
onCreateOptionsMenu inside Fragments
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it won't be called if you don't add this line: setHasOptionsMenu(true);
– Yoann Hercouet
Sep 21 '13 at 10:01
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Peak detection in a 2D array
...measuring pressure under a dogs paw. I use Python for my data analysis and now I'm stuck trying to divide the paws into (anatomical) subregions.
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Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
.../y - 1/x^2) but they will be equally complicated.
Let's look at 1/sqrt(y) now. You can try f(x) = x^2 - 1/y, but it will be equally complicated: dx = 2xy / (y*x^2 - 1) for instance.
One non-obvious alternate choice for f(x) is: f(x) = y - 1/x^2
Then: dx = -f/f' = (y - 1/x^2) / (2/x^3) = 1/2 * x * ...