Plot – Add a button to display properties on a chart

I want to draw the graphic from $ f (x) = x ^ {3} -x + 2 $ next to two buttons with the names "Property1" and "Property2", where "f1 (1) positive" is displayed when "Property1" is pressed, while "Property2" "shows f # (1) = 2 "is displayed.

I can only draw my idea as follows:

f(x_) = x^3 - x + 2;
f'(x_) = 3*x^2 - 1;
pt1 = Plot(x^3 - 3*x + 1, {x, -1, 3}, PlotRange -> {-2, 6});
pt2 = Manipulate(p(1), {p, {f, f'}});
GraphicsRow({pt1, pt2})

Enter the image description here

Could someone help me? Thank you very much.

How do I add "result" to an ER diagram?

I have created an ER diagram and a class diagram for my individual independent project called University Management System I will attach the ER diagram and the class diagram where I drowned. This is actually an EER diagram, not just ER.

Enter the image description here

Enter the image description here

My problem is that the subject is a common attribute of the result object and student Entities. So how do I put the result attribute in the ER diagram. My opinion is therefore the result is common object and studentwe can add it to the student-subject relationship (on the
Relationship named follows) as shown below.

Enter the image description here

Is it right? Then, in my opinion, the database table should be as follows. (This student relationship is a relationship of many to many)

subject_student (subject_ID, student_ID, result). Is that correct?

And how I present the result in my class diagram. Will it be kept as a property of the subject (use bu using a card and & # 39; student id stamps & # 39; as & # 39; key-value & # 39; pairs) or will it be kept as a property of the student (using the card & # 39; subjctId-reslut & # 39; as key-value pair) or keep a new class called result? what should I do for it

And finally: what is the best way to insert results into the system? This means that there are fields in the results sheet such as the student ID and the grades. How should the result be added? bu with json format or with cvs?

html – Add images dynamically with JavaScript

To create elements dynamically in JavaScript, simply use the createElement function by passing the name of the tag you want to create as an argument (in this case, the tag ).

After you create the image element, set the attribute src the image path and add the element you created in the div with appendChild. See the following example:

function criaImagem(){
    div = document.getElementById("imagens");
    
    image = document.createElement("img");
    image.src = prompt("Digite o nome ou link da imagem: ");
    
    div.appendChild(image);
}

Darts – Add another button to Flutter

I'm starting Flutter and it doesn't let me create another button next to the previous one, ie another one to subtract the status. The method works, but I can't add another button from which I come React Any recommendations?

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  void _decrementCounter() {
    setState(() {
      _counter--;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: (
            Text(
              'You have:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ),
        ),
      ),
      floatingActionButton: new FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _decrementCounter,
        tooltip: 'Decrement',
        child: Icon(Icons.remove),
      ),
    );
  }
}

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Python – dynamically add a new parent class to an existing object

How can you dynamically add a new parent class in Python to an existing object?

class A:
    def doA(self): print('A::doA')

class C(A): pass

c = C()

# class 'B' is created after object 'c'
class B:
    def doB(self): print('B::doB')

# XXX: python magic here, which adds dynamically 'B' to the list of parent classes of 'C'
#      as if 'C' was created like this "class C(A,B): pass"

c.doB() # works

Is it possible to dynamically add transactions to a Merkle tree?

When I read about Merkle trees, I saw that we were going to build a system in which we could summarize all the transactions that took place in about 10 minutes to stay in one block. I mean … whatever is known … the known transactions are made into a block.
But my question is whether I need to group my logs by component … how … I get a new log file for a product every hour … and I want everyone to stay in the same block, how and when it happens , , Is it possible?

In short … is it possible to add transactions dynamically in a Merkle tree?
Is this a bad implementation? In this case, does the computing power increase each time a transaction is added? We have to reprocess the entire blockchain.

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