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How can I plot with 2 different y-axes?
...t2)
ggplot(dat, aes(x,y)) +
geom_point() +
facet_wrap(~ index, scales = "free_y")
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What is the difference between atomic / volatile / synchronized?
...on but they won't update data.
AtomicXXX:
AtomicXXX classes support lock-free thread-safe programming on single variables. These AtomicXXX classes (like AtomicInteger) resolves memory inconsistency errors / side effects of modification of volatile variables, which have been accessed in multiple th...
Why are side-effects modeled as monads in Haskell?
...s a rephrasing of the laws; the list of "do X" statements is precisely the free monoid on the unknown structure created via (>>=); and the monad laws are just monoid laws on endofunctor composition.
– C. A. McCann
Aug 18 '11 at 7:04
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What is the function of the push / pop instructions used on registers in x86 assembly?
... them are actually being used. But reading from a register is effectively free, zero latency. So it's infinitely faster than L1 cache, depending on how you want to define terms. For read-only locals spilled to the stack, the main cost is just extra load uops (sometimes memory operands, sometimes ...
How do HTML parses work if they're not using regexp?
...ed a push-down automaton, and it recognizes languages generated by context-free grammars. Here, we can recognize correctly matched parentheses--indeed, a stack is the perfect memory model for it.
Well, is this good enough for HTML? Sadly, no. Maybe for super-duper carefully validated XML, actual...
Why Choose Struct Over Class?
...d class should only be used when necessary. Structs are much safer and bug free, especially in a multithreaded environment. Yes, you can always use a class in place of a struct, but structs are preferable.
– drewag
Sep 22 '14 at 8:22
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Generating an Excel file in ASP.NET [closed]
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This is a free wrapper around SpreadML--it works great.
http://www.carlosag.net/Tools/ExcelXmlWriter/
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Java HashMap performance optimization / alternative
...d where a ={1, 0}, all else being equal.
Utilise what Java gives you for free.
public int hashCode() {
return 31 * Arrays.hashCode(a) + Arrays.hashCode(b);
}
I'm pretty sure this has much less chance of clashing than your existing hashCode method, although it depends on the exact nature of ...
How much does it cost to develop an iPhone application? [closed]
...t: ~$100,000, and that's insanely cheap!
And they will give this away for free so clients will buy from their store from their iPhones.
For your app, Peter, if you have the servers and the APIs and the design, I'd guess at $30,000 to $60,000 depending on complexity. If you do not have the design,...
Haskell: Lists, Arrays, Vectors, Sequences
...t, but tend to run on the order of 20 times slower than C strings, so feel free to use Data.Text or the very fast Data.ByteString. I'm sure there are other sequence oriented libraries I'm not thinking of right now.
Conclusion
90+% of the time I need a sequential collection in Haskell lists are t...