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How to use R's ellipsis feature when writing your own function?
...he unevaluated expression".
When you call my_ellipsis_function(a=1:10,b=11:20,c=21:30) then ... "creates" a list of arguments: list(a=1:10,b=11:20,c=21:30) and substitute make it a list of four elements:
List of 4
$ : symbol list
$ a: language 1:10
$ b: language 11:20
$ c: language 21:30
First e...
Key existence check in HashMap
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523
Do you ever store a null value? If not, you can just do:
Foo value = map.get(key);
if (value !...
Cython: “fatal error: numpy/arrayobject.h: No such file or directory”
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edited Oct 26 '14 at 15:54
DilithiumMatrix
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How to execute a Ruby script in Terminal?
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251
Just call: ruby your_program.rb
or
start your program with #!/usr/bin/env ruby,
make your f...
Algorithm to generate all possible permutations of a list?
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32 Answers
32
Active
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How do I determine k when using k-means clustering?
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142
You can maximize the Bayesian Information Criterion (BIC):
BIC(C | X) = L(X | C) - (p / 2) * lo...
Symfony 2: How do I check if a user is not logged in inside a template?
In Symfony 2 templates (using Twig), how can I effectively check whether a user is not logged in?
2 Answers
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Difference between Apache CXF and Axis
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229
Keep in mind, I'm completely biased (PMC Chair of CXF), but my thoughts:
From a strictly "can...
How to use JavaScript variables in jQuery selectors?
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245
var name = this.name;
$("input[name=" + name + "]").hide();
OR you can do something like thi...
How to check if a number is a power of 2
Today I needed a simple algorithm for checking if a number is a power of 2.
25 Answers
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