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Best way to store date/time in mongodb
...s basically the BSON representation of a JavaScript Date object. It's a 64-bit integer that stores the milliseconds since the Unix epoch and supports (most?) of the methods from the JavaScript specification.
– Niels van der Rest
Sep 25 '10 at 6:16
...
Run an OLS regression with Pandas Data Frame
...import statsmodels.formula.api as sm
>>> df = pd.DataFrame({"A": [10,20,30,40,50], "B": [20, 30, 10, 40, 50], "C": [32, 234, 23, 23, 42523]})
>>> result = sm.ols(formula="A ~ B + C", data=df).fit()
>>> print(result.params)
Intercept 14.952480
B 0.401182
C ...
How to check if any flags of a flag combination are set?
... public enum Pet {
None = 0,
Dog = 1,
Cat = 2,
Bird = 4,
Rabbit = 8,
Other = 16
}
public class Example
{
public static void Main()
{
// Define three families: one without pets, one with dog + cat and one with a dog only
Pet[] petsInFamilies = { Pet.None, Pet.Dog ...
Bash empty array expansion with `set -u`
... |
edited May 2 at 10:40
answered Apr 3 '13 at 6:08
...
Google Authenticator implementation in Python
... & 15
h = (struct.unpack(">I", h[o:o+4])[0] & 0x7fffffff) % 1000000
return h
def get_totp_token(secret):
return get_hotp_token(secret, intervals_no=int(time.time())//30)
It has two functions:
get_hotp_token() generates one-time token (that should invalidate after single u...
What is the Haskell response to Node.js?
...ust the linear complexity caused by epoll. And just let us dont talk about windows performance... Node.js is much faster because it uses IOCP.
– Kr0e
Aug 2 '13 at 13:55
...
Why is Double.MIN_VALUE in not negative
...
The IEEE 754 format has one bit reserved for the sign and the remaining bits representing the magnitude. This means that it is "symmetrical" around origo (as opposed to the Integer values, which have one more negative value). Thus the minimum value is s...
ng-model for `` (with directive DEMO)
...
answered Jun 12 '13 at 10:20
Endy TjahjonoEndy Tjahjono
21.9k2020 gold badges7575 silver badges109109 bronze badges
...
#pragma pack effect
...mething like:
struct foo {
char a;
int b;
};
With a typical 32-bit machine, you'd normally "want" to have 3 bytes of padding between a and b so that b will land at a 4-byte boundary to maximize its access speed (and that's what will typically happen by default).
If, however, you have t...
Returning the product of a list
...3 int is Python 2 long. Python 2 will be using "int" until it overflows 32 bits; Python 3 will use "long" from the start. (2) Python 3.0 was a "proof of concept". Upgrade to 3.1 ASAP!
– John Machin
Jan 20 '10 at 22:30
...