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Returning the product of a list
... With python 2.7.5
from operator import mul
import numpy as np
import numexpr as ne
# from functools import reduce # python3 compatibility
a = range(1, 101)
%timeit reduce(lambda x, y: x * y, a) # (1)
%timeit reduce(mul, a) # (2)
%timeit np.prod(a) # (3)
%ti...
How to set or change the default Java (JDK) version on OS X?
...
First run /usr/libexec/java_home -V which will output something like the following:
Matching Java Virtual Machines (3):
1.8.0_05, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home
1.6.0_65-b14-462, x86_64: ...
A CORS POST request works from plain JavaScript, but why not with jQuery?
...t was the case for me in FF 4.0 & Chrome 10.0.648.204).
jQuery's $.ajax method sends the "x-requested-with" header for all cross domain requests (i think its only cross domain).
So the missing header needed to respond to the OPTIONS request is:
//no longer needed as of jquery 1.5.2
Access-Con...
Select SQL Server database size
...mb total_size_mb
-------------- ------------ ------------- -------------
xxxxxxxxxxx 512.00 302.81 814.81
-- sp_spaceused
database_name database_size unallocated space
---------------- ------------------ ------------------
xxxxxxxxxxx 814.81 MB 13.04 MB
Fun...
What is the difference between '/' and '//' when used for division?
...
In Python 3.x, 5 / 2 will return 2.5 and 5 // 2 will return 2. The former is floating point division, and the latter is floor division, sometimes also called integer division.
In Python 2.2 or later in the 2.x line, there is no differe...
How fast is D compared to C++?
...ks like neither dmd nor gdc inlined scalar_product, but g++/gdc did emit MMX instructions, so they might be auto-vectorizing the loop.
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Sort array of objects by single key with date value
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You can use Array.sort.
Here's an example:
var arr = [{
"updated_at": "2012-01-01T06:25:24Z",
"foo": "bar"
},
{
"updated_at": "2012-01-09T11:25:13Z",
"foo": "bar"
},
{
"updated_at": "2012-01-05T04:13:24Z",
"foo": "...
How do you round a floating point number in Perl?
...t
route.
printf("%.3f", 3.1415926535); # prints 3.142
The POSIX module (part of the standard Perl distribution) implements
ceil(), floor(), and a number of other mathematical and trigonometric
functions.
use POSIX;
$ceil = ceil(3.5); # 4
$floor = f...
C# list.Orderby descending
...
Sure:
var newList = list.OrderByDescending(x => x.Product.Name).ToList();
Doc: OrderByDescending(IEnumerable, Func).
In response to your comment:
var newList = list.OrderByDescending(x => x.Product.Name)
.ThenBy(x => x.Product.Price)
...
Pandas convert dataframe to array of tuples
...out:
subset = data_set[['data_date', 'data_1', 'data_2']]
tuples = [tuple(x) for x in subset.to_numpy()]
for pandas < 0.24 use
tuples = [tuple(x) for x in subset.values]
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