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Apply a function to every row of a matrix or a data frame
... 3 4
[3,] 5 6
R> apply(M, 1, function(x) 2*x[1]+x[2])
[1] 4 10 16
R>
This takes a matrix and applies a (silly) function to each row. You pass extra arguments to the function as fourth, fifth, ... arguments to apply().
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Finding element's position relative to the document
...s.
– Flash Thunder
Nov 20 '14 at 15:10
regarding the margin stuff... it might help to set the box-sizing to border-box...
Checking if a variable is an integer
... will fail because of the string being interpreted as octal, Integer('08', 10) works fine. Just in case.
– Jong Bor Lee
Mar 10 '15 at 18:38
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Android emulator failed to allocate memory 8
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410
+50
Update: ...
How to convert linq results to HashSet or HashedSet
...press the type of T explicitly:
var query = from i in Enumerable.Range(0, 10)
select new { i, j = i + 1 };
var resultSet = query.ToHashSet();
You can't do that with an explicit call to the HashSet<T> constructor. We're relying on type inference for generic methods to do it for u...
grep a file, but show several surrounding lines?
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610
-A and -B will work, as will -C n (for n lines of context), or just -n (for n lines of context....
Rounding a double to turn it into an int (java)
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Drupad Panchal
38333 silver badges1010 bronze badges
answered Apr 16 '10 at 17:13
Mihir MathuriaMihir Mathuria
6...
Checking if a key exists in a JS object
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answered Jun 15 '13 at 18:10
SirkoSirko
62.5k1717 gold badges123123 silver badges156156 bronze badges
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How can I list all tags in my Git repository by the date they were created?
...r-each-ref --format="%(taggerdate): %(refname)" --sort=-taggerdate --count=10 refs/tags did exactly what I needed. Thanks!
– Jon Ursenbach
Jun 7 '11 at 18:58
21
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What's the name for hyphen-separated case?
...pologies. Note that spinal-case/Train-Case were added to Wikipedia on 2012-10-07 without reference by an anonymous user from an IP address without other Wikipedia history. I couldn't find any other evidence for those terms that didn't circularly go back to Wikipedia. On the other hand, I felt this...