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Quicksort: Choosing the pivot
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There are several options.
Simple: Pick the first or last element of the range. (bad on partially sorted input)
Better: Pick the item in the middle of the range. (better on partially sorted input)
However, picking any arbitrary element runs the risk of poorly partitioning the array of size n into...
How do you copy the contents of an array to a std::vector in C++ without looping?
...C-style arrays are perfectly valid containers for most STL algorithms--the raw pointer is equivalent to begin(), and (ptr + n) is equivalent to end().
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Do I have to guard against SQL injection if I used a dropdown?
...mysqli. Mostly by accident, I presume, but anyway, I have to warn you that raw mysqli is not an adequate substitution for the old mysq_* functions. Simply because if used in the old style, it will add no security at all. While it's support for the prepared statements is painful and troublesome, to t...
Should the hash code of null always be zero, in .NET
... example, the hash code of an int is just the int, so it uses the full int range. What value in that range do you choose for null? Whatever one you pick will collide with the value's hash code itself.
Collisions in and of themselves are not necessarily a problem, but you need to know they are there...
How to get Linux console window width in Python
... left, top, right, bottom, maxx, maxy) = struct.unpack("hhhhHhhhhhh", csbi.raw)
sizex = right - left + 1
sizey = bottom - top + 1
return sizex, sizey
else:
return None
def _getTerminalSize_tput():
# get terminal width
# src: http://stackoverflow.com/quest...
How to Use Order By for Multiple Columns in Laravel 4?
...coloumn2', 'ASC')
->get();
and the second way to do it is,
Using raw order by:
MyTable::orderByRaw("coloumn1 DESC, coloumn2 ASC");
->get();
Both will produce same query as follow,
SELECT * FROM `my_tables` ORDER BY `coloumn1` DESC, `coloumn2` ASC
As @rmobis specified in commen...
Javascript equivalent of Python's zip function
... make this handle any iterable (e.g. in Python you can use zip on strings, ranges, map objects, etc.), you could define the following:
function iterView(iterable) {
// returns an array equivalent to the iterable
}
However if you write zip in the following way, even that won't be necessary:
f...
What is the difference between BIT and TINYINT in MySQL?
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TINYINT[(M)] [UNSIGNED] [ZEROFILL]
A very small integer. The signed range
is -128 to 127. The unsigned range is
0 to 255.
Additionally consider this;
BOOL, BOOLEAN
These types are synonyms for
TINYINT(1). A value of zero is
considered false. Non-zero values are
considered tru...
How to get a one-dimensional scalar array as a doctrine dql query result?
... an array of values from the id column of the Auction table.
If this was a raw SQL I would write:
5 Answers
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Delete rows from a pandas DataFrame based on a conditional expression involving len(string) giving K
... end with some profiling stats on why @User's drop solution is slower than raw column based filtration:-
%timeit df_new = df[(df.E>0)]
345 µs ± 10.5 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)
%timeit dft.drop(dft[dft.E < 0].index, inplace=True)
890 µs ± 94.9 µs per loo...