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Numpy: find first index of value fast
..."""return the index of the first occurence of item in vec"""
for i in xrange(len(vec)):
if item == vec[i]:
return i
return -1
and then:
>>> a = array([1,7,8,32])
>>> find_first(8,a)
2
...
Find element's index in pandas Series
...
In [4]: myseries = pd.Series(data, index=range(1,26))
In [5]: myseries[21]
Out[5]: 150
In [7]: %timeit myseries[myseries == 150].index[...
How to search through all Git and Mercurial commits in the repository for a certain string?
..."search for this" [file...]
There are other options that narrow down the range of revisions that are searched.
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minimum double value in C/C++
...finite-math-only, -fno-rounding-math, -fno-signaling-nans and -fcx-limited-range This option is not turned on by any -O option since it can result in incorrect output for programs which depend on an exact implementation of IEEE or ISO rules/specifications for math functions. It may, however, yield f...
decompiling DEX into Java sourcecode
...
The above sentence rang a bell - it seems to be a semi-quote from here: geeknizer.com/decompile-reverse-engineer-android-apk (or the other way around?). The linked articles briefly explains the above mentioned tools as well as Smali and APKTool...
Preferred Java way to ping an HTTP URL for availability
...s <code>true</code> if the response code is in
* the 200-399 range.
* @param url The HTTP URL to be pinged.
* @param timeout The timeout in millis for both the connection timeout and the response read timeout. Note that
* the total timeout is effectively two times the given timeout....
Using jquery to get element's position relative to viewport
... @return {array} An array containing both X and Y positions as a number
* ranging from 0 (under/right of viewport) to 1 (above/left of viewport)
*/
function visibility(obj) {
var winw = jQuery(window).width(), winh = jQuery(window).height(),
elw = obj.width(), elh = obj.height(),
...
When to use volatile with multi threading?
...echanism for a release store to only flush itself and a few select address-ranges: it would have to sync everything because it wouldn't know what other threads might want to read if their acquire-load saw this release-store (forming a release-sequence that establishes a happens-before relationship a...
Fastest way to tell if two files have the same contents in Unix/Linux?
...nt hashes. The reality is though, that the hash space is finite, while the range of possible files to hash is not - eventually you will have a collision. In cryptology it's called the Birthday Attack.
– will
Feb 18 '16 at 9:51
...
Java NIO FileChannel versus FileOutputstream performance / usefulness
...at java.nio is faster than java.io. Solidly faster. Like in the >250% range. That said, I am eliminating obvious bottlenecks, which I suggest your micro-benchmark might suffer from. Potential areas for investigating:
The buffer size. The algorithm you basically have is
copy from disk to b...