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Better way to shuffle two numpy arrays in unison
...s:
a = numpy.array([[[ 0., 1., 2.],
[ 3., 4., 5.]],
[[ 6., 7., 8.],
[ 9., 10., 11.]],
[[ 12., 13., 14.],
[ 15., 16., 17.]]])
b = numpy.array([[ 0., 1.],
[ 2., 3.],
...
Is it safe to ignore the possibility of SHA collisions in practice?
... we have a billion unique images, one megabyte each.
We calculate the SHA-256 hash for the contents of each file.
The possibility of collision depends on:
...
How to make CSS width to fill parent?
...
Caerulius
37522 silver badges1919 bronze badges
answered Feb 9 '10 at 20:54
prodigitalsonprodigitalson
...
A fast method to round a double to a 32-bit int explained
... bits of mantissa.
Now, to the magic number; as you correctly stated, 6755399441055744 is 2^51 + 2^52; adding such a number forces the double to go into the "sweet range" between 2^52 and 2^53, which, as explained by Wikipedia here, has an interesting property:
Between 252=4,503,599,627,370,4...
Covariance, Invariance and Contravariance explained in plain English?
...(A)) = parametertype(method asdeclaredin(B)) when overriding. Since Java 1.5, covariant return types are permitted when overriding, i.e. the following will compile in Java 1.5, but not in Java 1.4:
class Collection {
Iterator iterator() { ... }
}
class List extends Collection {
@Override
...
Is it possible to have a Subversion repository as a Git submodule?
...
richqrichq
51.5k1818 gold badges144144 silver badges141141 bronze badges
...
Python: How would you save a simple settings/config file?
...|
edited Nov 29 '19 at 12:55
answered Sep 29 '13 at 13:42
G...
Caveats of select/poll vs. epoll reactors in Twisted
..., 100, then that's roughly twice as expensive as selecting on a single fd, 50. Adding more fds below the highest isn't quite free, so it's a little more complicated than this in practice, but this is a good first approximation for most implementations.
The cost of epoll is closer to the number of ...
The modulo operation on negative numbers in Python
...ame sign as the denominator (divisor). Your expression yields 3 because
(-5) / 4 = -1.25 --> floor(-1.25) = -2
(-5) % 4 = (-2 × 4 + 3) % 4 = 3.
It is chosen over the C behavior because a nonnegative result is often more useful. An example is to compute week days. If today is Tuesday (day #2),...
Browsers' default CSS for HTML elements
...lorer
3. Default Styles for Chrome / Webkit
4. Default Styles for Opera
5. Default Styles for HTML4 (W3C spec)
6. Default Styles for HTML5 (W3C spec)
Sample, per the default W3C HTML4 spec:
html, address,
blockquote,
body, dd, div,
dl, dt, fieldset, form,
frame, frameset,
h1, h2, h3, h4,
h5, h...