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Numpy - add row to array
... = array([[0, 1, 2], [1, 2, 0], [2, 1, 2], [3, 2, 0]])
add to A all rows from X where the first element < 3:
import numpy as np
A = np.vstack((A, X[X[:,0] < 3]))
# returns:
array([[0, 1, 2],
[0, 2, 0],
[0, 1, 2],
[1, 2, 0],
[2, 1, 2]])
...
Deleting queues in RabbitMQ
...d:
Returns a RabbitMQ node to its virgin state.
Removes the node from any cluster it belongs to, removes all data from
the management database, such as configured users and vhosts, and
deletes all persistent messages.
So, be careful using it.
...
Why do stacks typically grow downwards?
...early CPUs. For example, the Motorola 6809 would fetch the program counter from addresses 0xfffe/f so you could start running at an arbitrary location, depending on what was supplied at that address (usually, but by no means limited to, ROM).
One of the first things some historical systems would d...
Maven project version inheritance - do I have to specify the parent version?
...
@halil The question is about inheriting a version from a parent with the goal to have the same version in two artifacts. If you have different parents with different versions (in an inheritance hierarchy) you probably will not make them all the same version. I therefore do n...
How to check if a string is a valid hex color representation?
...-> match beginning
# -> a hash
[0-9A-F] -> any integer from 0 to 9 and any letter from A to F
{6} -> the previous group appears exactly 6 times
$ -> match end
i -> ignore case
If you need support for 3-character HEX codes, use the following:
/...
Approximate cost to access various caches and main memory?
...ch more (extremely) useful details of the i7 and Xeon range of processors (from a performance point of view).
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Parse date string and change format
... without having to specify the format like you do with datetime.strptime.
from dateutil.parser import parse
dt = parse('Mon Feb 15 2010')
print(dt)
# datetime.datetime(2010, 2, 15, 0, 0)
print(dt.strftime('%d/%m/%Y'))
# 15/02/2010
...
Android and setting width and height programmatically in dp units
...
You'll have to convert it from dps to pixels using the display scale factor.
final float scale = getContext().getResources().getDisplayMetrics().density;
int pixels = (int) (dps * scale + 0.5f);
...
How to specify maven's distributionManagement organisation wide?
...arent pom file project (with packaging 'pom') generically for all projects from your organization.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.or...
Static methods in Python?
...e "top-level" function would have been clearer.
The following is verbatim from the documentation::
A static method does not receive an implicit first argument. To declare a static method, use this idiom:
class C:
@staticmethod
def f(arg1, arg2, ...): ...
The @staticmethod form is a functi...