base

I'm interested to specify types of missing values. I have data that have different types of missing and I am trying to code these values as missing in R, but I am looking for a solution were I can still distinguish between them. Say I have some data that looks like this, set.seed(667) df <- data.frame(a = sample(c("Don't know/Not sure","Unknown","Refused","Blue", "Red", "Green"), 20, rep=TRUE), b = sample(c(1, 2, 3, 77, 88, 99), 10, rep=TRUE), f = round(rnorm(n=10, mean=.90, sd=.08), digits = 2), g = sample(c("C","M","Y","K"), 10, rep=TRUE) ); df # a b f g # 1 Unknown 2 0.78 M # 2 Refused 2 0

This is for the purpose of having a nice short URL which refers to an md5 hash in a database. I would like to convert something like this: a7d2cd9e0e09bebb6a520af48205ced1 into something like this: hW9lM5f27 Those both contain about the same amount of information. The method doesn't have to be direct and reversible but that would be nice (more flexible). At the least I would want a randomly generated string with the hex hash as the seed so it is reproducible. I'm sure there are many possible answers, I am curious to see how people would do it in an elegant way. Oh, this doesn't have to have

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: During the iOS linking phase, I started seeing errors for my React Native project. React Native version: 0.41.2 , 0.40 , 0.39 All worked fine, I edited the Android version, React Native code didn't change, when this kind of linking errors started showing up with headers on /node_modules/react-native/React/Base/{RCTHeaderName.h} path not being found: In file included from /Users/user/ReactNativeProject/node_modules/react-native-vector-icons/RNVectorIconsManager/RNVectorIconsManager.h:9: ../react-native/React/Base/RCTBridgeModule.h:12:9: fatal

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to practice Inheriting Constructors in C++. I have compiled and run following program in gcc and it's working fine. #include<iostream> using namespace std; class Base1 { public: Base1() { cout<<"Base1 Default Constructor\n"; } Base1(int i) { cout<<"Base1 parametrized Constructor\n"; } }; class Base2 { public: Base2() { cout<<"Base2 Default Constructor\n"; } Base2(const string& s) { cout<<"Base2 parametrized Constructor\n"; } }; class Derived :public Base1, public Base2 { public: using Base1::Base1; using Base2::Base2; }; int main(

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I don't understand the following from pep-0404 In Python 3, implicit relative imports within packages are no longer available - only absolute imports and explicit relative imports are supported. In addition, star imports (e.g. from x import *) are only permitted in module level code. What is a relative import? In what other places star import was allowed in python2? Please explain with examples. 回答1: Relative import happens whenever you are importing a package relative to the current script/package. Consider the following tree for

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: Possible Duplicate: cannot call base class protected functions? I don't understand the following, when Derived inherits from Base , it gets access to its protected members which can be accessed through Derived functions. But if, Base class tries to access its own members from Derived class (which itself allows access to Base ), it doesn't get access, why? class Base { protected : int x ; }; class Derived : Base { public : void foo ( Base * b ); }; void Derived :: foo ( Base * b ) { b -> x = 2 ; // cannot access protected member, //

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Models from sqlalchemy.ext.declarative import declarative_base from sqlalchemy import Column, ForeignKey from sqlalchemy import Integer from sqlalchemy import Unicode from sqlalchemy import TIMESTAMP from sqlalchemy.orm import relationship BaseModel = declarative_base() class Base(BaseModel): __tablename__ = 'base' id = Column(Integer, primary_key=True) location = Column(Unicode(12), ForeignKey("locationterrain.location"), unique=True,) name = Column(Unicode(45)) ownerid = Column(Integer,ForeignKey("player.id")) occupierid = Column(Integer,