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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
... = A[i][j];
which is just horrible for a modern CPU. One solution is to know the details about your cache system and tweak the algorithm to avoid those problems. Works great as long as you know those details.. not especially portable.
Can we do better than that? Yes we can: A general approach to ...
What is Persistence Context?
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hmmm, it makes sense now. Do you have a similar "Simple" definition which tells the difference between container-managed & application-managed Entity Managers?
– Amrit
Nov 12 '13 at 13:35
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HTML5 Canvas Resize (Downscale) Image High Quality?
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fixed, i changed "good" to "best", is this ok now? :D. On the other hand if you want best possible resample - use imagemagick.
– ViliusL
Oct 7 '13 at 15:43
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How do I add 1 day to an NSDate?
...= [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
// now build a NSDate object for the next day
NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
[offsetComponents setDay:1];
NSDate *nextDate = [gregorian dateByAddingComponents:offsetComponents toDate: [N...
Cleaner way to update nested structures
...ess,
set = (p: Person, addr: Address) => p.copy(address = addr))
Now, compose them to get a lens that changes zipcode in a person:
val personZipCodeLens = personAddressLens andThen addressZipCodeLens
Finally, use that lens to change raj:
val updatedRaj = personZipCodeLens.set(raj, pers...
What are the relative strengths and weaknesses of Git, Mercurial, and Bazaar? [closed]
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Heya. I just want to you know that cscvs is still being used to run Launchpad code imports, and I had the Canonical version released when I worked there.
– ddaa
Oct 19 '08 at 21:41
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Creating an API for mobile applications - Authentication and Authorization
...t is the point of doing that? 3) This method assumes the attacker doesn't know how login_token + password are hashed, which violates the Kerckhoffs principle and makes it really insecure.
– Tamer Shlash
Dec 27 '16 at 6:25
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Ways to save Backbone.js model data?
...what Backbone uses internally but since it doesn't have an official ID it knows that it should create a new resource and it sends a POST request. If you got your model from the server, it will probably have an ID if all was right. In this case, when you save() Backbone assumes you want to update the...
How does deriving work in Haskell?
...Generic Classes, but it was rarely used, as it was somewhat weak.
That has now been taken out, and work is ongoing to integrate a new generic deriving mechanism as described in this paper: http://www.dreixel.net/research/pdf/gdmh.pdf
For more on this, see:
GHC wiki: http://hackage.haskell.org/tra...
Inline labels in Matplotlib
... less than 0.2). See this question for a particularly nasty example. Right now, the code does not intelligently identify this scenario and re-arrange the labels, however there is a reasonable workaround. The labelLines function takes the xvals argument; a list of x-values specified by the user inste...