Find unique rows in numpy.array

Find unique rows in numpy.array

I need to find unique rows in a numpy.array.For example:>>> a # I havearray([[1, 1, 1, 0, 0, 0], [0, 1, 1, 1, 0, 0], [0, 1, 1, 1, 0, 0], [1, 1, 1, 0, 0, 0], [1, 1, 1, 1, 1, 0]])>>> new_a # I want to get toarray([[1,

When to use self over $this?

When to use self over $this?

In PHP 5, what is the difference between using self and $this?When is each appropriate? 1:Short Answer Use $this to refer to the current object. Use self to refer to the current class. In other words, use $this->member for non-static

What's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN and FULL JOIN? [duplicate]

What's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN and FULL JOIN? [duplicate]

This question already has an answer here: What is the difference between “INNER JOIN” and “OUTER JOIN”? 33 answers What's the d

The 3 different equals

The 3 different equals

What is the difference between =, ==, and ===?I think using one equal sign is to declare a variable while two equal signs is for a comparison condition and lastly three equal signs is for comparing values of declared variables. 1:You hav

Websockets and binary data

Websockets and binary data

As far as i know websockets support binary data transfer. Binary support bug is fixed.So, are there any websocket servers which support binary data transfer? Socket.io seems to miss this opportunity. Maybe there are some others? 1:Suppor

Authentication and privileges on Relay/GraphQL

Authentication and privileges on Relay/GraphQL

Facebook does not mention authentication for their GraphQL library.Suppose I have a users table fetchable from GraphQL and I do not wish to disclose users information to anybody who demands it except the logged in user, at what level should

Differences between class declarations

Differences between class declarations

There are many ways to declare a new class type:TMyClass1 = TObject;TMyClass2 = type TObject;TMyClass3 = class end;TMyClass4 = class(TObject);TMyClass5 = class(TObject) end;It's my understanding that class 3, 4 and 5 are descendants of TObj

Forward declare a struct in Objective-C

Forward declare a struct in Objective-C

I'm creating a protocol, and one of the parameters to a method I'm defining is a CMTime*. I would like to forward declare CMTime as opposed to including it. However, I've tried @class CMTime and it complains that it is redefined elsewhere a

yylval and union

yylval and union

What is the purpose of union in the yacc file? Is it directly related to yylval in the flex file? If you don't use yylval, then you don't need to use union? 1:The purpose of the union is to allow storing different kind of objects into

Capture conversion issue in Java, WRT reconciliation of JLS and actual JDK behaviour

Capture conversion issue in Java, WRT reconciliation of JLS and actual JDK behaviour

Given the following two class definitions:class C1> {}class C2 extends C1> {}Consider the following type declaration:C1> c;This compiles fine in JDK-8u45, but if we examine the specification for capture conversion, it appears (to me) that t

How to emulate a BEFORE INSERT trigger in T-SQL / SQL Server for super/subtype (Inheritance) entitie

How to emulate a BEFORE INSERT trigger in T-SQL / SQL Server for super/subtype (Inheritance) entitie

This is on Azure.I have a supertype entity and several subtype entities, the latter of which needs to obtain their foreign keys from the primary key of the super type entity on each insert. In Oracle, I use a BEFORE INSERT trigger to accomp

C# generic with constant

C# generic with constant

Is there something similar to this C++ template?template class B{ int f() { return A; }}I want to make every instance of B, B, etc (eg tuple) a different type. 1:The short answer is no.It doesn't fit the way C# generics,

Why does the boolean data type need 8 bits? [duplicate]

Why does the boolean data type need 8 bits? [duplicate]

This question already has an answer here: Why is Javas boolean primitive size not defined? 7 answers Boolean data type only evaluates to true or false,

How to extend Java annotation?

How to extend Java annotation?

In my project I use pre-defined annotation @With:@With(Secure.class)public class Test { //....The source code of @With:@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.TYPE)public @interface With { Class[] value() default {};}I wa

Exhaustive condition of switch case in Swift

Exhaustive condition of switch case in Swift

The Apple documentation says Every switch statement must be exhaustive. That is, every possible value of the type being considered must be matched by one of the switch cases.So in new Xcode I have placed a code like thisprintln(UInt16.mi

What does “where” mean in a C# class declaration?

What does “where” mean in a C# class declaration?

I tried to google this, but all I could find was documents on ordinary class declarations.public class DataContextWrapper : IDataContextWrapper where T : DataContext, new(){}I see that the class implements IDataContextWrapper, inherits from

What is the template idiom?

What is the template idiom?

I was reading this and was trying to understand what N3601 was about. It said this idiom comes up a lot in a web search, but I couldn't find anything. What is thetemplateidiom, what does it solve, how is it used, what is are Implicit templa

C++ inconsistency between gcc and clang

C++ inconsistency between gcc and clang

I came across a C++ inconsistency between gcc (versions 4.8.1, 4.8.2) and clang (versions 3.3, 3.4). I wonder which one is correct. Here's the program:template struct Result {};template struct Empty {};template struct Bad_Type_Fcn { ty

Why does numeric_limits::min return a negative value for int but positive values for float/double?

Why does numeric_limits::min return a negative value for int but positive values for float/double?

Why does numeric_limits::min return a negative value for int, but positive values for e.g. float and double?#include#includeusing namespace std;int main() { cout ::min() ::min() ::min() Output: int: -2147483648 float: 1.17549e-38 double: 2

.NET Caching how does Sliding Expiration work?

.NET Caching how does Sliding Expiration work?

If I use an ObjectCache and add an item like so:ObjectCache cache = MemoryCache.Default;string o = "mydata";cache.Add("mykey", o, DateTime.Now.AddDays(1));I understand the object will expire in 1 day. But if the object is accessed 1/2 a day

Why does the 2-tuple Functor instance only apply the function to the second element?

Why does the 2-tuple Functor instance only apply the function to the second element?

import Control.Applicativemain = print $ fmap (*2) (1,2)produces (1,4). I would expect it it to produce (2,4) but instead the function is applied only to the second element of the tuple.Update I've basically figured this out almost straight

Typescript primitive types: any difference between the types “number” and “Number” (is TSC case-inse

Typescript primitive types: any difference between the types “number” and “Number” (is TSC case-inse

I meant to write a parameter of type number, but I misspelled the type, writing Number instead. On my IDE (JetBrains WebStorm) the type Number is written with the same color that is used for the primitive type number, while if I write a nam

Two or more data types in declaration specifiers error [closed]

Two or more data types in declaration specifiers error [closed]

I am pretty new to C.I am getting this error: incompatible implicit declaration of built-in function ‘malloc’Even when I fix the code based on the answers to include , I still get: two or more data types in declaration specifiersWhen tryi

Is BIGINT(8) the largest integer mysql can store?

Is BIGINT(8) the largest integer mysql can store?

I've got some numbers that is now larger than INT can handle.This is a bit embarassing, but I honestly don't know exactly what the BIGINT(8) means. Is the 8 in that the max bit value or the max length?So BIGINT(1) can only be one digit? Or

Unity IOC container and how to resolve different instances of the same interface

Unity IOC container and how to resolve different instances of the same interface

I have a unity container that I am registering types within like so: IUnityContainer container = new UnityContainer().RegisterType( "PopulationRate" ).RegisterType( "BusinessLicenseRate" );Then I also want to register 2 different service