I am new to web development (started with the MEAN stack) and I got stuck with this I suppose obvious answer, but I couldn't find a solution here yet so I thought I give it a shot.

What I would like to do in short is:

* Retrieve several Values from an Array
* Include those extracted values into a new scope
* Everything should happen in the controller, since I would like to post all values, including the new one in my database (mongo).

Ideally, I would retrieve the values and add them to the new value like so

```
index = value[0]*weight[0] + value[1]*weight[1].... and so forth 

```

I have the following code snippet inside my angular controller

```
 $scope.alerts = [
    { title: 'someTitle1',
      weighttitle: 'someweightTitle1',
      value: 1,
      weight: 30,
      options: {
        showTicks: true,
        hidePointerLabels: true,
        hideLimitLabels: true,
        stepsArray: [
            { value: 1, legend: 'Very poor' },
            { value: 2, legend: 'Very poor' },
            { value: 3, legend: 'Fair' },
            { value: 4, legend: 'Very poor' },
            { value: 5, legend: 'Average' }

        ]
      }
    },
    { title: 'someTitle2',
      weighttitle: 'someweightTitle2',
      value: 1,
      weight: 60,
      options: {
        showTicks: true,
        hidePointerLabels: true,
        hideLimitLabels: true,
        stepsArray: [
            { value: 1, legend: 'Very poor' },
            { value: 2, legend: 'Very poor' },
            { value: 3, legend: 'Fair' },
            { value: 4, legend: 'Very poor' },
            { value: 5, legend: 'Average' }

        ]
      }
    }
];

```

I thought the solution should somehow look like this

```
$scope.index = alert.value*alert.weight

```

but that did not quite make it. I am pretty clueless at this point how to retrieve those values. Maybe I have a misunderstanding of the underlying concept.

Grateful for any help!

The solutions did work, but they did not change dynamically. 
The HTML code for this problem looks like this:

```
<section ng-controller="ArticlesController">
  <div class="page-header">
    <h1>Neue Evaluierung</h1>
  </div>
  <div class="col-md-12">
    <form name="articleForm" class="form-horizontal" ng-submit="create(articleForm.$valid)" novalidate>
      <fieldset>

        <div class="row form-group">
         <h3>Projekttitel</h3><input type="submit" class="btn btn-default btn-lg btn-success">
        </div>
        <div ng-show="error" class="text-danger">
          <strong ng-bind="error"></strong>
        </div>

        <input name="title" type="text" ng-model="title" id="title" class="form-control">

        <div ng-repeat="alert in alerts">

          <h3>{{alert.someTitle}}</h3>
          <input type="number" ng-model="alert.value"/>

          <div>
            <rzslider rz-slider-model="alert.value"
                      rz-slider-options="alert.options"></rzslider>
          </div>

          <br>
          <br>
          <br>
          <br>

          <div>
            <h4>{{alert.someweightTitle}}</h4>
            <input type="number" ng-model="alert.weight"/>
            <div>
              <md-slider flex md-discrete ng-model="alert.weight" step="1" min="1" max="100" aria-label="rating"></md-slider>
            </div>
          </div>

          <input type="number" ng-model="index"/>
          <input type="number" ng-model="indexdynamic"/>

        </div>

      </fieldset>
    </form>
  </div>
</section>

```