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Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
I've been profiling some of our core math on an Intel Core Duo, and while looking at various approaches to square root I've noticed something odd: using the SSE scalar operations, it is faster to take a reciprocal square root and multiply it to get the sqrt, than it is to use the native sqrt opcode!...
Python vs Cpython
What's all this fuss about Python and CPython (Jython,IronPython) , I don't get it:
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Python: finding an element in a list [duplicate]
What is a good way to find the index of an element in a list in Python?
Note that the list may not be sorted.
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Is there a good reason I see VARCHAR(255) used so often (as opposed to another length)?
In multiple courses, books, and jobs, I have seen text fields defined as VARCHAR(255) as kind of the default for "shortish" text. Is there any good reason that a length of 255 is chosen so often, other than being a nice round number ? Is it a holdout from some time in the past when there was a go...
Obfuscated C Code Contest 2006. Please explain sykes2.c
How does this C program work?
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What's the difference between array_merge and array + array?
A fairly simple question. What's the difference between:
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RegEx to exclude a specific string constant [duplicate]
Can regular expression be utilized to match any string except a specific string constant let us say "ABC" ? Is this possible to exclude just one specific string constant? Thanks your help in advance.
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What is a git topic branch?
What is a git topic branch? Does it differ from an ordinary branch in some way? Are there any branches that are not topic branches?
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How can I check if my python object is a number? [duplicate]
In Java the numeric types all descend from Number so I would use
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Peak signal detection in realtime timeseries data
Update: The best performing algorithm so far is this one .
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