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Sort rows in data.table in decreasing order on string key `order(-x,v)` gives error on data.table 1.
...om%2fquestions%2f12353820%2fsort-rows-in-data-table-in-decreasing-order-on-string-key-order-x-v-gives-er%23new-answer', 'question_page');
}
);
Post as a guest
...
Why does modern Perl avoid UTF-8 by default?
...CODE envariable to AS. This makes all Perl scripts decode @ARGV as UTF‑8 strings, and sets the encoding of all three of stdin, stdout, and stderr to UTF‑8. Both these are global effects, not lexical ones.
At the top of your source file (program, module, library, dohickey), prominently assert tha...
Default value in Doctrine
...can use:
<?php
/**
* @Entity
*/
class myEntity {
/**
* @var string
*
* @Column(name="myColumn", type="string", length="50")
*/
private $myColumn = 'myDefaultValue';
...
}
PHP-level default values are preferred as these are also properly available on newly crea...
Detect Safari browser
...
Doesn't work. Currently outputting chrome UA string on iPhone and it doesn't even have the word "chrome" in it.
– Paul Carlton
Jul 1 '14 at 22:59
6
...
Why do we need break after case statements?
...how many days in a month.
class SwitchDemo2 {
public static void main(String[] args) {
int month = 2;
int year = 2000;
int numDays = 0;
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
...
How can I use interface as a C# generic type constraint?
...e T : IBase;
public interface IBase { }
public interface IActual : IBase { string S { get; } }
public class Actual : IActual { public string S { get; set; } }
Now there's nothing stopping you from calling Foo thus:
Foo<Actual>();
The Actual class, after all, satisfies the IBase constraint...
How to grep (search) committed code in the Git history
...:
this looks for differences that introduce or remove an instance of <string>.
It usually means "revisions where you added or removed line with 'Foo'".
the --pickaxe-regex option allows you to use extended POSIX regex instead of searching for a string.
Example (from git log): git log -S"frot...
Pass Multiple Parameters to jQuery ajax call
...
Don't use string concatenation to pass parameters, just use a data hash:
$.ajax({
type: 'POST',
url: 'popup.aspx/GetJewellerAssets',
contentType: 'application/json; charset=utf-8',
data: { jewellerId: filter, locale: '...
How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
...frozensets or tuples), but this method fails in Python 3 when keys are not strings.
>>> c = dict(a, **b)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: keyword arguments must be strings
From the mailing list, Guido van Rossum, the creator of...
Covariance, Invariance and Contravariance explained in plain English?
...ovariant, contravariant, or invariant? Covariant would mean that a List<String> is a subtype of List<Object>, contravariant that a List<Object> is a subtype of List<String> and invariant that neither is a subtype of the other, i.e. List<String> and List<Object> ar...