categories

问题 Context: I am creating a kind-of-wiki page in Angular. The wiki page would probably not get bigger than 5000 articles in total. I want to get the most efficient (pageload) way possible but I think I am too new to this to oversee the consequences of one option over the other. Of course I also would like to follow conventions. Problem: I have a collection of articles in firestore which I want to categorize. An article should belong to one category. A category can belong to one category (as a

问题 Context: I am creating a kind-of-wiki page in Angular. The wiki page would probably not get bigger than 5000 articles in total. I want to get the most efficient (pageload) way possible but I think I am too new to this to oversee the consequences of one option over the other. Of course I also would like to follow conventions. Problem: I have a collection of articles in firestore which I want to categorize. An article should belong to one category. A category can belong to one category (as a

问题 Let say I have this dataframe: raw_data = {'regiment': ['Nighthawks', 'Nighthawks', 'Nighthawks', 'Nighthawks', 'Dragoons', 'Dragoons', 'Dragoons', 'Dragoons', 'Scouts', 'Scouts', 'Scouts', 'Scouts'], 'payout': [.1, .15, .2, .3, 1.2, 1.3, 1.45, 2, 2.04, 3.011, 3.45, 1], 'name': ['Miller', 'Jacobson', 'Ali', 'Milner', 'Cooze', 'Jacon', 'Ryaner', 'Sone', 'Sloan', 'Piger', 'Riani', 'Ali'], 'preTestScore': [4, 24, 31, 2, 3, 4, 24, 31, 2, 3, 2, 3], 'postTestScore': [25, 94, 57, 62, 70, 25, 94, 57,

问题 I'm trying to execute if statement using time and numerical value to make a new column categorical column Condition - if time is between 05:00:00 and 19:00:00 and t_value > 0 & t_value <=13 then classify as "C" else "IC" If time is not in the range then classify as NA Example Input t_value 2020-05-17 00:00:00 0 2020-05-17 01:00:00 0 2020-05-17 02:00:00 0 2020-05-17 03:00:00 0 2020-05-17 04:00:00 0 2020-05-17 05:00:00 0 2020-05-17 06:00:00 0 2020-05-17 07:00:00 8 2020-05-17 08:00:00 9 2020-05

问题 I'm trying to execute if statement using time and numerical value to make a new column categorical column Condition - if time is between 05:00:00 and 19:00:00 and t_value > 0 & t_value <=13 then classify as "C" else "IC" If time is not in the range then classify as NA Example Input t_value 2020-05-17 00:00:00 0 2020-05-17 01:00:00 0 2020-05-17 02:00:00 0 2020-05-17 03:00:00 0 2020-05-17 04:00:00 0 2020-05-17 05:00:00 0 2020-05-17 06:00:00 0 2020-05-17 07:00:00 8 2020-05-17 08:00:00 9 2020-05

问题 Can I use a class category to override a method that is already implemented using a category? Like this: 1) Original method -(BOOL) method { return true; } 2) Overrided method -(BOOL) method { NSLog(@"error?"); return true; } Will this work, or is this illegal? 回答1: From Apple documentation: Although the Objective-C language currently allows you to use a category to override methods the class inherits, or even methods declared in the class interface, you are strongly discouraged from doing so

问题 What I have in my iOS app is: TO DO ITEMS To do item 3 24/03/2020 ------------ To do item 2 24/03/2020 ------------ To do item 1 23/03/2020 ------------ What I would like to have is: TO DO ITEMS 24/03 To do item 3 24/03/2020 ------------ To do item 2 24/03/2020 ------------ 23/03 To do item 1 23/03/2020 ------------ =============== What I have so far: I am using Core Data and have 1 Entity: Todo . Module: Current Product Module. Codegen: Class Definition. This entity has 2 attributes: title

问题 I have a dataset with a categorical variable that contains three unique values, "low", "medium" and "high": df.CatVar.value_counts() Out[93]: Medium 35832 Low 25311 High 12527 Name: CatVar, dtype: int64 I am trying to plot the number of unique values as a bar-plot. However, the following code gives me the bars in the order ["Medium", "Low", "High"] df.CatVar.value_counts().plot(kind="bar") How do I change the order of the bars in the plot? 回答1: There are 2 possible solutions - change order of

问题 Objective-C category feature allows programmer to add new method which was not defined in original class definition. Can I archive similar functionality (language construct or some technique) on C++? Major concern is consistent method calling syntax ( . or -> operator). 回答1: Let's consider the following class to be extended: struct A { int x, y; A(int x, int y) : x(x), y(y) {} }; You can inherit from this class or write a wrapper class which contains an instance of this class. In most cases,

问题 Objective-C category feature allows programmer to add new method which was not defined in original class definition. Can I archive similar functionality (language construct or some technique) on C++? Major concern is consistent method calling syntax ( . or -> operator). 回答1: Let's consider the following class to be extended: struct A { int x, y; A(int x, int y) : x(x), y(y) {} }; You can inherit from this class or write a wrapper class which contains an instance of this class. In most cases,