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gem install: Failed to build gem native extension (can't find header files)
...l ruby-all-dev
If you are using a earlier version of ruby (such as 2.2), then you will need to run:
sudo apt-get install ruby2.2-dev
(where 2.2 is your desired Ruby version)
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How to unload a package without restarting R
...g, but conceivably this could be used in a program to use one function and then another--although namespace referencing is probably a better idea for that use).
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How to download a Nuget package without nuget.exe or Visual Studio extension?
...
Either make an account on the Nuget.org website, then log in, browse to the package you want and click on the Download link on the left menu.
Or guess the URL. They have the following format:
https://www.nuget.org/api/v2/package/{packageID}/{packageVersion}
Then simpl...
Does C# have extension properties?
...yield return unchecked((byte)(this >> (i-1)*8));
}
}
}
then you would be able to do this:
foreach (byte b in 0x_3A_9E_F1_C5_DA_F7_30_16ul)
{
WriteLine($"{e.Current:X}");
}
And for a static interface:
public interface IMonoid<T> where T : IMonoid<T>
{
stati...
How do you follow an HTTP Redirect in Node.js?
... you can also install the types
npm install @types/follow-redirects
and then use
import { http, https } from 'follow-redirects';
Disclosure: I wrote this module.
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...
mongodb, replicates and error: { “$err” : “not master and slaveOk=false”, “code” : 13435 }
...his:
Create a file named replStart.js, containing one line: rs.slaveOk()
Then include --shell replStart.js when you launch the Mongo shell. Of course, if you're connecting locally to a single instance, this doesn't save any typing.
...
Redis key naming conventions?
...he custom "id". If you have a composite id with locale=en and category=15, then the actual id could be {en,15}, so namespace:texts#{en,15} , or to be more verbose: namespace:texts#{locale=en,category=15}. But this is just an idea, I have never used it like this. Be careful not to change the order of...
Math - mapping numbers
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Divide to get the ratio between the sizes of the two ranges, then subtract the starting value of your inital range, multiply by the ratio and add the starting value of your second range. In other words,
R = (20 - 10) / (6 - 2)
y = (x - 2) * R + 10
This evenly spreads the numbers fro...
Modulo operator with negative values [duplicate]
...3 => 6
so a%b => 1
Note that
If both operands are nonnegative then the remainder is nonnegative; if
not, the sign of the remainder is implementation-defined.
from ISO14882:2003(e) is no longer present in ISO14882:2011(e)
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Java recursive Fibonacci sequence
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Much faster then recursive. The only reservation is that it won't work for n=1. Additional condition is needed
– v0rin
Nov 24 '16 at 23:50
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