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How to slice an array in Bash
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317
See the Parameter Expansion section in the Bash man page. A[@] returns the contents of the arr...
Ruby - elegantly convert variable to an array if not an array already
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153
[*foo] or Array(foo) will work most of the time, but for some cases like a hash, it messes it up...
Phonegap Cordova installation Windows
.../cordova is absolutely horrible. All I'm trying to do is install PhoneGap 3.0 on my Windows environment but having no success.
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When is “i += x” different from “i = i + x” in Python?
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3 Answers
3
Active
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php中json_decode()和json_encode()的使用方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Example #1 json_decode() 的例子
<?php
$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';
var_dump(json_decode($json));
var_dump(json_decode($json, true));
?>
上例将输出：
object(stdClass)#1 (5) {
["a"] => int(1)
["b"] => int(2)
["c"] => int(3)
["d"] => int(4)
["e"] => i...
What does -1 mean in numpy reshape?
...numpy allow us to give one of new shape parameter as -1 (eg: (2,-1) or (-1,3) but not (-1, -1)). It simply means that it is an unknown dimension and we want numpy to figure it out. And numpy will figure this by looking at the 'length of the array and remaining dimensions' and making sure it satisfi...
How to check if two arrays are equal with JavaScript? [duplicate]
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C. Tewalt
2,02322 gold badges2323 silver badges4242 bronze badges
answered May 8 '13 at 9:22
enyoenyo
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NULL values inside NOT IN clause
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Query A is the same as:
select 'true' where 3 = 1 or 3 = 2 or 3 = 3 or 3 = null
Since 3 = 3 is true, you get a result.
Query B is the same as:
select 'true' where 3 <> 1 and 3 <> 2 and 3 <> null
When ansi_nulls is on, 3 <> null is UNKNOWN,...
Installing Python 3 on RHEL
I'm trying to install python3 on RHEL using the following steps:
19 Answers
19
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Insert a line at specific line number with sed or awk
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243
sed -i '8i8 This is Line 8' FILE
inserts at line 8
8 This is Line 8
into file FILE
-i doe...