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Fastest way to replace NAs in a large data.table
I have a large data.table , with many missing values scattered throughout its ~200k rows and 200 columns. I would like to re code those NA values to zeros as efficiently as possible.
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How to check if two arrays are equal with JavaScript? [duplicate]
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This is what you should do. Please do not use stringify nor < >.
function arraysEqual(a, b) {
if (a === b) return true;
if (a == null || b == null) return false;
if (a.length !== b.length) return false;
// If you don't care about the order of the elements in...
Where does Oracle SQL Developer store connections?
...ected to my Oracle Database 11g Express Edition. I created a test database in this edition, and I can connect to the database fine using Oracle SQL Developer, create tables, views etc. However, I'm having a hard time getting connected via my application. Where is the connection information? In what ...
How to delete duplicate lines in a file without sorting it in Unix?
Is there a way to delete duplicate lines in a file in Unix?
9 Answers
9
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Java, How do I get current index/key in “for each” loop [duplicate]
In Java, How do I get the current index for the element in Java?
7 Answers
7
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Multi-line strings in PHP
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Well,
$xml = "l
vv";
Works.
You can also use the following:
$xml = "l\nvv";
or
$xml = <<<XML
l
vv
XML;
Edit based on comment:
You can concatenate strings using the .= operator.
$str = "Hello";
$str .= " World";
echo $str; //Will echo out "Hello World";
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Adding the little arrow to the right side of a cell in an iPhone TableView Cell
...f UITableViewCell.
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
In Swift 3,
cell.accessoryType = .disclosureIndicator
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Interface or an Abstract Class: which one to use?
Please explain when I should use a PHP interface and when I should use an abstract class ?
11 Answers
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Boolean vs boolean in Java
There are discussions around Integer vs int in Java. The default value of the former is null while in the latter it's 0 . How about Boolean vs boolean ?
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What are some (concrete) use-cases for metaclasses?
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I have a class that handles non-interactive plotting, as a frontend to Matplotlib. However, on occasion one wants to do interactive plotting. With only a couple functions I found that I was able to increment the figure count, call draw manually, etc, but ...