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What does .SD stand for in data.table in R
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.SD stands for something like "Subset of Data.table". There's no significance to the initial "...
Transparent ARGB hex value
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Transparency is controlled by the alpha channel (AA in #AARRGGBB). Maximal value (255 dec, FF ...
Return multiple values in JavaScript?
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20 Answers
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How to convert hex to rgb using Java?
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* @param colorStr e.g. "#FFFFFF"
* @return
*/
public static Color hex2Rgb(String colorStr) {
return new Color(
Integer.valueOf( colorStr.substring( 1, 3 ), 16 ),
Integer.valueOf( colorStr.substring( 3, 5 ), 16 ),
Integer.valueOf( colorStr.substring( 5, 7...
Interview question: Check if one string is a rotation of other string [closed]
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26 Answers
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Error: Jump to case label
...In the following code, if foo equals 1, everything is ok, but if it equals 2, we'll accidentally use the i variable which does exist but probably contains garbage.
switch(foo) {
case 1:
int i = 42; // i exists all the way to the end of the switch
dostuff(i);
break;
case 2:
dostu...
Convert JavaScript string in dot notation into an object reference
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26 Answers
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How to replace plain URLs with links?
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24 Answers
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What does this square bracket and parenthesis bracket notation mean [first1,last1)?
I have seen number ranges represented as [first1,last1) and [first2,last2) .
4 Answers
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How can I apply a function to every row/column of a matrix in MATLAB?
...on, one way to do it is to collect the rows or columns into cells using mat2cell or num2cell, then use cellfun to operate on the resulting cell array.
As an example, let's say you want to sum the columns of a matrix M. You can do this simply using sum:
M = magic(10); %# A 10-by-10 matrix...