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Test if string is a number in Ruby on Rails
...g -------------------------------------
# cast 57485 i/100ms
# cast fail 5549 i/100ms
# to_s 47509 i/100ms
# to_s fail 50573 i/100ms
# regexp 45187 i/100ms
# regexp fail 42566 i/100ms
# ------------...
Could not load file or assembly 'Newtonsoft.Json, Version=4.5.0.0, Culture=neutral, PublicKeyToken=3
...t;runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="Newtonsoft.Json"
publicKeyToken="30AD4FE6B2A6AEED" culture="neutral"/>
<bindingRedirect oldVersion="0.0.0.0-6.0.0....
How to Calculate Execution Time of a Code Snippet in C++
...N32
/* Windows */
FILETIME ft;
LARGE_INTEGER li;
/* Get the amount of 100 nano seconds intervals elapsed since January 1, 1601 (UTC) and copy it
* to a LARGE_INTEGER structure. */
GetSystemTimeAsFileTime(&ft);
li.LowPart = ft.dwLowDateTime;
li.HighPart = ft.dwHighDateTime;
uint64 ret...
How many GCC optimization levels are there?
...rpret the source code of GCC 5.1
We'll try to understand what happens on -O100, since it is not clear on the man page.
We shall conclude that:
anything above -O3 up to INT_MAX is the same as -O3, but that could easily change in the future, so don't rely on it.
GCC 5.1 runs undefined behavior if you...
How to customize user profile when using django-allauth
... what worked for me combining a few of the other answers (none of them are 100% complete and DRY).
In yourapp/forms.py:
from django.contrib.auth import get_user_model
from django import forms
class SignupForm(forms.ModelForm):
class Meta:
model = get_user_model()
fields = ['fi...
Associating enums with strings in C#
...e extension model:
public enum MyEnum
{
[Description("String 1")]
V1= 1,
[Description("String 2")]
V2= 2
}
Your Extension Class
public static class MyEnumExtensions
{
public static string ToDescriptionString(this MyEnum val)
{
DescriptionAttribute[] attributes = ...
Is there a NumPy function to return the first index of something in an array?
...eals naturally with multidimensional arrays:
>>> arr1 = np.ones((100, 100, 100))
>>> arr1[2, 2, 2] = 2
>>> index(arr1, 2)
(2, 2, 2)
>>> arr2 = np.ones(20)
>>> arr2[5] = 2
>>> index(arr2, 2)
(5,)
This can be much faster (because it's short-c...
How to install Google Play Services in a Genymotion VM (with no drag and drop support)?
...o the latest version.
Download two zip files:
- ARM Translation Installer v1.1
- Google Apps for your Android version: 2.3.7 - 4.4.4 or 4.4 - 6.0 (with platform and variant) You can also find the GApps list in the wbroek user GitHubGist page.
Open Genymotion emulator and go to home screen then dra...
data.table vs dplyr: can one do something well the other can't or does poorly?
...ncluding benchmarks by Matt on grouping from 10 million to 2 billion rows (100GB in RAM) on 100 - 10 million groups and varying grouping columns, which also compares pandas. See also updated benchmarks, which include Spark and pydatatable as well.
On benchmarks, it would be great to cover these rem...
What is the difference between “px”, “dip”, “dp” and “sp”?
...een space.
If running on an hdpi device, a 150 x 150 px image will take up 100 * 100 dp of screen space.
If running on an xhdpi device, a 150x150 px image will take up 75 * 75 dp of screen space.
The other way around: say, you want to add an image to your application and you need it to fill a 100 ...