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How to create the most compact mapping n → isprime(n) up to a limit N?
...aper.
If you want to find big numbers, look into primes that have special forms like Mersenne primes.
The algorithm I usually implement (easy to understand and code) is as follows (in Python):
def isprime(n):
"""Returns True if n is prime."""
if n == 2:
return True
if n == 3:
...
How to tell whether a point is to the right or left side of a line
...re a = line point 1; b = line point 2; c = point to check against.
If the formula is equal to 0, the points are colinear.
If the line is horizontal, then this returns true if the point is above the line.
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Why should I use 'li' instead of 'div'?
...VER, back in the day (and maybe still), each browser added it's own little formatting to list elements, like spacing, margins, etc, so that is exactly why a lot of people prefer using divs. because no one wants to add a bunch of code to zero out formatting, or to detect browsers, and those slight d...
Proper way to use **kwargs in Python
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pylint flags it as bad form to use kwargs in __init__(). Can someone explain why this is a lint-worthy transgression?
– hughdbrown
Nov 16 '09 at 5:16
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What's an appropriate HTTP status code to return by a REST API service for a validation failure?
...I is supposed to have an ISO-8601 date and you find that it's in the wrong format or refers to February 31st, then you would return an HTTP 400. Ditto if you expect well-formed XML in an entity body and it fails to parse.
(1/2016): Over the last five years WebDAV's more specific HTTP 422 (Unproces...
Why does C++ require a user-provided default constructor to default-construct a const object?
...9), the default constructor for T is called (and the initialization is ill-formed if T has no accessible default constructor);
It simply talks about default constructor of T, whether its user-defined or compiler-generated is irrelevant.
If you're clear up to this, then understand what the spec ne...
The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or
... x[[i]]
x[[i, j]]
x$a
x$"a"
For vectors and matrices the [[ forms are rarely used, although they have some slight semantic differences from the [ form (e.g. it drops any names or dimnames attribute, and that partial matching is used for character indices). When indexing multi-dimensio...
Differences between contentType and dataType in jQuery ajax function
...
From the documentation:
contentType (default: 'application/x-www-form-urlencoded; charset=UTF-8')
Type: String
When sending data to the server, use this content type. Default is "application/x-www-form-urlencoded; charset=UTF-8", which is fine for most cases. If you explicitly pass in a co...
Saving and Reading Bitmaps/Images from Internal memory in Android
... image to the OutputStream
bitmapImage.compress(Bitmap.CompressFormat.PNG, 100, fos);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace(...
Commenting in a Bash script inside a multiline command
...need to be before the \ continuation.
Note that parameter expansion is performed inside the comment:
$ ls file
ls: cannot access 'file': No such file or directory
$ echo foo${IFS# This command will create file: $(touch file)}bar
foo bar
$ ls file
file
Rare exception
The only rare case this fail...