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How can I convert a datetime object to milliseconds since epoch (unix time) in Python?
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Automatically expanding an R factor into a collection of 1/0 indicator variables for every factor le
...epth of knowledge in matrix algebra and model formulation). After digging more, I've been able to gather that the -1 is just specifying not to include the "intercept" column. If you leave out the -1, you'll see an intercept column of 1's in the output with one binary column left out. You're able ...
How do I add BundleConfig.cs to my project?
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BundleConfig is nothing more than bundle configuration moved to separate file. It used to be part of app startup code (filters, bundles, routes used to be configured in one class)
To add this file, first you need to add the Microsoft.AspNet.Web.Opt...
Tab key == 4 spaces and auto-indent after curly braces in Vim
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set expandtab
The help files take a bit of time to get used to, but the more you read, the better Vim gets:
:help smartindent
Even better, you can embed these settings in your source for portability:
:help auto-setting
To see your current settings:
:set all
As graywh points out in the co...
Meaning of $? (dollar question mark) in shell scripts
...status of 0 means success, and non-zero return status means failure. Learn more about exit statuses on wikipedia.
There are other special variables like this, as you can see on this online manual: https://www.gnu.org/s/bash/manual/bash.html#Special-Parameters
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Output to the same line overwriting previous output?
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Chrome browser reload options new feature
...refresh button you get this tooltip saying: "Reload this page, hold to see more options" and when I do it I get these three awesome options.
1. Normal Reload
2. Hard Reload
3. Empty Cache and Hard Reload (this is very useful option I believe)
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Why did Rails4 drop support for “assets” group in the Gemfile
...ompilation-on-demand in production. As Rails 4 doesn't behave like that anymore, it made sense to remove the asset group.
This is explained in more detail in the commit that changed that. I extracted some quotes with the actual answer.
Some gems can be needed (in production) like coffee-rails if yo...
Javascript: negative lookbehind equivalent?
...re accepted into the 2018 spec in 2017 and I gave links to sources. Furthermore, I described in detail which platforms implement said specification and what the status of other platforms is — and have even been updating it since. Naturally that's not the last Regexp feature we'll see
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Android SDK on a 64-bit linux machine
...ing Ubuntu/Gnome. Linux's fragmentation suggests the "correct" answer is a more general one or a combination of all of the following partially correct answers. I for one prefer the more generalized answer, as there are too many possible variations and updates to be sure of completeness and non-obsol...