## Function setup – trimming the graphics to fully connected components?

In a diagram such.

``````gr = graph[{UndirectedEdge[1, 2], UndirectedEdge[1, 3],
UndirectedEdge[2, 3], UndirectedEdge[1, 4], UndirectedEdge[2, 4],
UndirectedEdge[3, 4], UndirectedEdge[1, 5], UndirectedEdge[2, 6],
UndirectedEdge[3, 6]}]
``````

I would like to have a function `trim` This would remove all vertices from this chart that are not completely connected to all other vertices:

``````gr2 = trim[gr]
gr2 // FullForm
``````

`graph[List[1,2,3,4],List[UndirectedEdge[1,2], UndirectedEdge[1,3], UndirectedEdge[2,3], UndirectedEdge[1,4], UndirectedEdge[2,4], UndirectedEdge[3,4]]]`

Does Mathematica have such a function? Or is there a quick way to write with Mathematica functionality? Thanks for every suggestion.

## Should components in the Entity Component System pattern have logic?

It is often read that in entity component system patterns, we should treat components only as a passive data structure without logic. In this way, we follow a data-centric design approach with efficient use of cache memory and increase performance.

I developed a simple game with this rule, and as the game got bigger and bigger, I set up serious code snares like repeated code in systems. Let's say it's a shooter to illustrate an example. In this shooter, I fired bullets, so I made a BulletComponent and a BulletSystem that handle collisions and damage, and if nothing collides with collisions, the bullet disappears in five seconds. Then I wanted explosives, so I created the ExplosiveComponent and the BlastSystem. Once the explosive is placed, it explodes in ten seconds. At this point we can notice the first repeated code between systems, then we can create an abstraction and we create a DurationComponent and a DurationSystem so that the projectile and the explosive contain it with the time it should hold. Then I realized that the explosives should explode. I want to create a particle effect in the environment, so that this abstraction is no longer valid, because I want to perform various actions as time passes. But if I happen to be in the beginning, I have the repeated code between systems (ugh!). This example is simple, but I face complex things like AI or the reaction to collisions.

One solution I came up with is that I really wanted an ActionComponent with an ActionSystem that performs the action contained in the component. In this way, I break that components contain only data and they should have no logic! This is more of a "hybrid" approach. However, if you think deeply, the ActionSystem is very generic and you can do almost anything with it. Therefore, it is difficult to determine whether a system is required or not. The same can be applied to collisions. Instead of many systems where the logic collides for different entities, you can simply have a CollisionHandlerComponent with the logic for each entity.

I've found the following benefits that generic systems like this make:

• Higher flexibility (you can easily customize any entity)
• No repeated code
• Fewer systems (more power?)

But as I said, the main drawback is that it really is confusing when a system is needed because you can capture the logic on components.

Is it wrong to follow this type of hybrid Ecs? If so, how would you take the example without repeating code in systems?

## GR group theory – Endel-by-torsion-free abelian groups (or compact abelian groups with finitely many components)

Here is a question to which I should know the answer, but not:

Accept $$1 to F to G to G / F to 1$$ is a short exact sequence of Abelian groups with $$F$$ finally and $$G / F$$ torsion. Does the sequence have to share?

This is not true if you only assume $$F$$ is twist. A counter example is given by YCor here: https://mathoverflow.net/a/314536/20598.

Let's assume right away $$G$$ is a compact abelian group with finitely many components. Then it does $$G_0 to G to G / G_0$$ Splits? This is not true assuming that there are finally many components, as the example of YCor shows, and this does not apply to non-adhesive groups, as the answer from Max shows here: https: //math.stackexchange .com / a / 954539/23805 (though I think it could be true if $$| G / G_0 | leq 3$$).

## Javascript – render user-defined components with the parameters for the route reaction

I have some snippets of code that I'm happy with, but I'm hoping for some advice for the future. Basically, I have a Main.js that contains all of my routes, a Class Component Friends.js that contains the data array, and a ViewFriend.js Stateless component that just displays the ID of the particular component that is being clicked. At the moment I can not display the data for this current component. I tried to put props into the route using "render" instead of "component" but could not get them to work. I think I over-wrote the latest props, because when I tried that, I could not access the match prop. What are your suggestions? I want to avoid creating a component for each friend and rendering the specific component with all the data from the parent component.

main.js

``````import React, {Component} & # 39; respond & # 39 ;;
import {switch, route} from & # 39; response-router-dom & # 39 ;;
Home of & # 39; / Home & # 39; import;
Import About from & # 39; ./ About & # 39 ;;
Import contact from & # 39; ./ Contact & # 39 ;;
import friends from & # 39; / Friends & # 39 ;;
ViewFriend of & # 39; ./ ViewFriend & # 39; import;

const Main = () => {
Return (

)
}

Export default setting;
``````

Friends.js

``````import React, {Component} & # 39; respond & # 39 ;;
{NavLink} of & # 39; React Router Dom & # 39; import;

Class friends extends component {
State = {
friends: [
{
name: 'Andrew',
age: 22,
id: 1
},
{
name: 'Bubba',
age: 30,
id: 2
},
{
name: 'Courtney',
age: 45,
id: 3
}
]
}

render () {
Return (

Friends page

{this.state.friends.map (friend =>

Name: {friend.name}

Age: {friend.age}

ID: {friend.id}

Show friend

)}

)
}
}

Export standard friends;
``````

ViewFriend.js

``````Import Reacting & # 39; Respond & # 39 ;;

const ViewFriend = (props) => {
Return (

{} Props.match.params.id

)
}

Export standard ViewFriend;
``````

Here is the code snippet I wanted to use as mentioned above …

``````<Route path = "/ friends /: id" render = {  } />
``````

Further considerations on the layout of the components would also be very grateful 🙂

Many Thanks!

## dnd 5e – Which components for the simulacrum spell are consumed?

… but reusing them after the spell is done can be difficult.

Through the text of the spell:

The duplicate is a creature, partially real and made of ice or snow, and it can take action and be affected like a normal creature.

We know that the snow and snails are alive and well at least for the duration of the spell. Plus, when the magic ends, the snow becomes water:

The simulacrum continues until it drops to 0 hit points. Then it falls in snow and melts immediately.

It does not explicitly state what happens when it does that durationbut we can conclude that it is about the same as falling to 0 hit points.

It also does not mention what happens to the hair / fingernail cutouts – but they would probably be left behind in the terrible mess.

If you execute the spell again, the snow + bits are lost:

If you use this spell again, any duplicate created with this spell will be destroyed immediately.

## Can I use a foci / spell component instead of clippings and snow?

I suppose that depends on the reading of the rule – you turn a large pile of snow into a fake person, who is then animated into a walking thing by the power of the spell. If you want to focus on that … you do not actually have one thing to animate so I do not allow it.

However, a strict reading of the rules does not cover this particular case.

However, it is not possible for you to fit a person's entire snow into a magic particle bag.

## dnd 5e – Which Simulacrum components are consumed?

The components of simulacrum Read as follows

Ingredients: V, S, M (in sufficient amount of snow or ice to make a copy of the life size duplicated creature, some hair, fingernail snippets, or any other piece of the body of that creature that has been placed in the snow or ice and powdered Ruby value 1,500 gp, scattered over the duplicate and consumed by the spell)

My question is whether snow / ice and body parts are consumed?

(This question is due to this question, which suggests that components that are not consumed can replace the arcane focus, and an excellent answer would also address this issue.)

## SD.LLBLGen.Pro.ORMSupportClasses.Web components can not be added to VS2017

I have connected a web project and a database 5.3 database.
I want to add LLBLGenProDataSource2 to my webpage, but there are no such in Toolbox.
I tried to add it via "Select Items …", but there is an error. There are no components in SD.LLBLGen.Pro.ORMSupportClasses.Web that can be placed in the toolbox

## Requirements – How to structure the SW documentation with SOUP components

I have to create documentation that complies with IEC 62304. When reading all the processes that need to be documented, I have some doubts about how to structure the entire documentation.

My concern is how the entire documentation is divided into separate documents and what should be included.

The entire software system can consist of 3 main subsystems:

• Firmware on the embedded device (# 1)
• An accompanying Android application (# 2)
• An application backend used to collect, process, and store data from the devices (# 3)

In particular, I'm responsible for the latest application, a fairly flow-oriented, flow-oriented application that processes and stores data in a DB (a SOUP in the case of IEC 62304 compliance).

Now, the data stored in the database is visualized in a Grafana dashboard: In which document should this component be taken into account? What should be the limit of scope for the # 3 application and how it interacts with the other components?
Since Grafana would be a SOUP, I thought about writing it in the appropriate document that contains all the configurations and the SOUP management.
Should I specify the requirements for the required visualizations in the SRS of # 3 application?
What is the appropriate document to include this information in?

I use it as a template for all the documentation needed on this blog, as I'm new to software development with ISO / Standard regulations, but additional resources to help structure all documents in this regard are highly appreciated.

Many Thanks

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## Design – How can I have many application components partially sharing the same model?

I'm trying to build the architecture of a new application we create. We wanted something very modular. Because we're open source and want others to easily add new features, we've chosen a component-based architecture.

We have a backend that was created in Java, and a frontend that is built with JavaFX and another frontend that is a website. We want the backend to be the same for users who use our application through a website or via a mobile / desktop device (JavaFX). My entire team, including myself, are students and do not have much experience designing new software.

The problem I'm facing is that I want to split the main functions into packages so that they make components that work independently of the frontend and can be easily modified. The thing is, sometimes different components interact with the same model. Let me illustrate my problem so you can understand it better.

This would be a very partial overview of my IntelliJ project structure:

``````- / src / main / java / com / ourDomainName / ourAppName
- / ApplicationCore
- / DriversCore
- / LoggingCore
- / Signal.Java
- / ParsersCore
- / Signal.Java
``````

`Application Core` would be the package that contains all the backend. `driver Core`, `Logging Core` and `ParsersCore` are packages that all represent a function. They are components. I want `ParsersCore` and `Logging Core` both use a specific one `model` Class, `signal`, My question is, where should I put the file? This situation does not just apply to a file, there are many files in mine `model` that I want to use different components. I know, many will only say that I should call a package `model` and all mine `model` there, but what I've seen, I should keep the whole model relative to a component in the same package as this component. What exactly is the procedure if you have many? `model` Classes to be shared by different components?