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Ruby: extend self
...inside the singleton class are basically class methods:
module A
class << self
def x
puts 'x'
end
end
end
A.x #=> 'x'
Now that we know that, extend will include the methods in the module inside the singleton class and thus expose them as class methods:
module A
clas...
How can I apply a function to every row/column of a matrix in MATLAB?
...
Many built-in operations like sum and prod are already able to operate across rows or columns, so you may be able to refactor the function you are applying to take advantage of this.
If that's not a viable option, one way to do it i...
How to wrap text in LaTeX tables?
...to the line width, while wrapping? So basically, I need begin{tabular}{lp{<whatever is left to fill the line width>}}
– Sander
Jun 23 '14 at 13:45
128
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Append an array to another array in JavaScript [duplicate]
...an do this in batches.
for (var n = 0, to_add = array2.concat(array3); n < to_add.length; n+=300) {
array1.push.apply(array1, to_add.slice(n, n+300));
}
If you do this a lot, create a method or function to handle it.
var push_apply = Function.apply.bind([].push);
var slice_call = Functi...
Remove all special characters from a string in R?
...e question, but it's much easier to remove all punctuation characters.
x <- "a1~!@#$%^&*(){}_+:\"<>?,./;'[]-=" #or whatever
str_replace_all(x, "[[:punct:]]", " ")
(The base R equivalent is gsub("[[:punct:]]", " ", x).)
An alternative is to swap out all non-alphanumeric characters.
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Comparing two files in linux terminal
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Sort them and use comm:
comm -23 <(sort a.txt) <(sort b.txt)
comm compares (sorted) input files and by default outputs three columns: lines that are unique to a, lines that are unique to b, and lines that are present in both. By specifying -1, -2 and/...
Convert any object to a byte[]
... it that way and Formatting a Object containing 3 int32 public members results in a 244 Bytes long ByteArray. Am I not knowing something about C# syntax or is there anything I would probabbly miss using?
– dhein
Sep 25 '14 at 11:56
...
Detect when an image fails to load in Javascript
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This:
<img onerror="this.src='/images/image.png'" src="...">
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How To: Execute command line in C#, get STD OUT results
...w do I execute a command-line program from C# and get back the STD OUT results? Specifically, I want to execute DIFF on two files that are programmatically selected and write the results to a text box.
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How to Programmatically Add Views to Views
...want to inflate during runtime, call the layout file as "textview.xml" :
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
</TextView>
BTW, se...