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How do I delete unpushed git commits?
...or me, git reset --hard origin says fatal: ambiguous argument 'origin': unknown revision or path not in the working tree.. Why?
– trss
Jul 10 '13 at 12:01
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搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
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rs.initiate(config);
#输出成功
{
"info" : "Config now saved locally. Should come online in about a minute.",
"ok" : 1
}
#查看日志，副本集启动成功后，138为主节点PRIMARY，136、137为副本节点SECONDARY。
Sun Dec 29 20:26:13.842 [conn3]...
get UTC time in PHP
... DateTimeZone.
The DateTime __construct() documentation suggests passing "now" as the first parameter when creating a DateTime instance and specifying a timezone to get the current time.
$date_utc = new \DateTime("now", new \DateTimeZone("UTC"));
echo $date_utc->format(\DateTime::RFC850); # Sa...
Android emulator-5554 offline
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This helped ind combination with 'Cold Boot now' just below 'Wipe Data'.
– S. Gissel
Apr 24 '19 at 11:00
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Swift: Convert enum value to String?
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Not sure in which Swift version this feature was added, but right now (Swift 2.1) you only need this code:
enum Audience : String {
case public
case friends
case private
}
let audience = Audience.public.rawValue // "public"
When strings are used for raw values, the implic...
Computational complexity of Fibonacci Sequence
I understand Big-O notation, but I don't know how to calculate it for many functions. In particular, I've been trying to figure out the computational complexity of the naive version of the Fibonacci sequence:
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What does -1 mean in numpy reshape?
...haped into a vector using reshape function with parameter -1. But I don't know what -1 means here.
9 Answers
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Format timedelta to string
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As you know, you can get the total_seconds from a timedelta object by accessing the .seconds attribute.
Python provides the builtin function divmod() which allows for:
s = 13420
hours, remainder = divmod(s, 3600)
minutes, seconds =...
Regular expression for floating point numbers
...tion.)
That said, most regex engines (actually, all of them, as far as I know) would accept \.. Most likely, there's an issue with escaping.
The Trouble with Escaping
Some languages have built-in support for regexes, such as JavaScript. For those languages that don't, escaping can be a problem.
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Why am I getting “Cannot Connect to Server - A network-related or instance-specific error”?
... IP Addresses(Tab). Go to the last entry IP All and mention TCP Port 1433. Now restart SQL Server (<INSTANCE>) using services.msc. After this, the problem got resolved!
– ani627
Feb 24 '15 at 13:26
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