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Generate random numbers with a given (numerical) distribution
... samples += [x]
nLoop+=1
return samples
#call
x0=2007
x1=2019
def custDist(x):
if x<2010:
return .3
else:
return (np.exp(x-2008)-1)/(np.exp(2019-2007)-1)
samples=random_custDist(x0,x1,custDist=custDist,size=1000)
print(samples)
#plot
import matplotlib.py...
总结const_cast、static_cast、dynamic_cast、reinterpret_cast - C/C++ - ...
...einterpret_cast:重新解释类型转换
const_cast:常量类型转换
专业的上面很多了,我说说我自己的理解吧:
synamic_cast一般用在父类和子类指针或应用的互相转化;
static_cast一般是普通数据类型(如int m=static_cast<int>(3.14));
reinterpret_cast...
裁员！裁员！创业者们的2016“寒冬大逃杀” - 资讯 - 清泛网 - 专注IT技能提升
...币的新融资，并宣布未来会以“考拉车载电台”的产品，接入主流汽车平台的车载系统。“车联网，恰恰是李建刚之前所擅长的，”邱琪说。
已经被淡忘在公众视野很久的游戏公司触控科技，在2014年冲击上市失败以后就再没有...
Best way to resolve file path too long exception
... </windowsSettings> </application> For me in Visual Studio 2019, this second requirement was not necessary after restarting Visual Studio.
– Tom Anderson
Nov 21 '19 at 4:02
...
Why did my Git repo enter a detached HEAD state?
...D.
See git: switch branch without detaching head
With Git 2.23 (August 2019), you don't have to use the confusing git checkout command anymore.
git switch can also checkout a branch, and get a detach HEAD, except:
it has an explicit --detach option
To check out commit HEAD~3 for temporar...
推荐系统算法初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...而与浏览记录无关。然而它也会存在一些弊端，比如过度专业化(over-specialisation)的问题。这种方法会一直推荐给用户内容密切关联的item，而失去了推荐内容的多样性。
2.4 基于模型的算法
基于模型的方法有很多，用到的诸如机...
How do I lock the orientation to portrait mode in a iPhone Web Application?
...wport {
orientation: portrait;
}
Here is the "Can I Use" page (as of 2019 only IE and Edge):
https://caniuse.com/#feat=mdn-css_at-rules_viewport_orientation
Spec(in process):
https://drafts.csswg.org/css-device-adapt/#orientation-desc
MDN:
https://developer.mozilla.org/en-US/docs/Web/CSS/@vi...
Convert a list of data frames into one data frame
...gt; packageVersion("data.table")
[1] ‘1.10.4’
UPDATE: Rerun 06-Aug-2019.
set.seed(21)
library(microbenchmark)
dflist <- vector(length=10,mode="list")
for(i in 1:100)
{
dflist[[i]] <- data.frame(a=runif(n=260),b=runif(n=260),
c=rep(LETTERS,10),d=rep(LET...
Does Django scale? [closed]
...s Mahalo. I'm told they handle roughly 10 million uniques a month. Now, in 2019, Mahalo is powered by Ruby on Rails.
Abroad, the Globo network (a network of news, sports, and entertainment sites in Brazil); Alexa ranks them in to top 100 globally (around 80th currently).
Other notable Django users...
getting date format m-d-Y H:i:s.u from milliseconds
...-d-Y H:i:s').substr(fmod(microtime(true), 1), 1);
example output:
02-06-2019 16:45:03.53811192512512
If you have a need to limit the number of decimal places then the below line (credit mgutt) would be a good alternative. (With the code below, the 6 limits the number of decimal places to 6.)
e...