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Radio button used in function graph
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<iframe 
    src="http://jsxgraph.uni-bayreuth.de/share/iframe/radio-button-used-in-function-graph" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Radio button used in function graph" 
    allowfullscreen
></iframe>
This code has to 
<div id="board-0-wrapper" class="jxgbox-wrapper " style="width: 100%; ">
   <div id="board-0" class="jxgbox" style="aspect-ratio: 1 / 1; width: 100%;" data-ar="1 / 1"></div>
</div>

<script type = "text/javascript"> 
    /*
    This example is licensed under a 
    Creative Commons Attribution ShareAlike 4.0 International License.
    https://creativecommons.org/licenses/by-sa/4.0/
    
    Please note you have to mention 
    The Center of Mobile Learning with Digital Technology
    in the credits.
    */
    
    const BOARDID = 'board-0';

    const board = JXG.JSXGraph.initBoard(BOARDID, {
        boundingbox: [-1, 5, 5, -1],
        axis: true
    });
    
    var radio = board.create('text', [0.5, 4, `
    <input type="radio" name="freq" value="1" onchange="change(this);" checked />1<br/>
    <input type="radio" name="freq" value="2" onchange="change(this);" />2<br/>
    <input type="radio" name="freq" value="3" onchange="change(this);" />3<br/>
    `], { fixed: true, frozen: true });
    
    radio.Value = function() {
        let opt = document.querySelector(`input[name=freq]:checked`);
        return opt = (opt != null) ? parseFloat(opt.value) : 1; // default value 1
    };
    
    // Update board on changing the radio button
    window.change = function(src) {
        board.update();
    }
    
    board.create('functiongraph', [
      function(x) {
            var r = radio.Value();
            return Math.sin(r * x) + 1;
      }
    ]);
 </script> 
/*
This example is licensed under a 
Creative Commons Attribution ShareAlike 4.0 International License.
https://creativecommons.org/licenses/by-sa/4.0/

Please note you have to mention 
The Center of Mobile Learning with Digital Technology
in the credits.
*/

const BOARDID = 'your_div_id'; // Insert your id here!

const board = JXG.JSXGraph.initBoard(BOARDID, {
    boundingbox: [-1, 5, 5, -1],
    axis: true
});

var radio = board.create('text', [0.5, 4, `
<input type="radio" name="freq" value="1" onchange="change(this);" checked />1<br/>
<input type="radio" name="freq" value="2" onchange="change(this);" />2<br/>
<input type="radio" name="freq" value="3" onchange="change(this);" />3<br/>
`], { fixed: true, frozen: true });

radio.Value = function() {
    let opt = document.querySelector(`input[name=freq]:checked`);
    return opt = (opt != null) ? parseFloat(opt.value) : 1; // default value 1
};

// Update board on changing the radio button
window.change = function(src) {
    board.update();
}

board.create('functiongraph', [
  function(x) {
        var r = radio.Value();
        return Math.sin(r * x) + 1;
  }
]);
<jsxgraph width="100%" aspect-ratio="1 / 1" title="Radio button used in function graph" description="This construction was copied from JSXGraph examples database: BTW HERE SHOULD BE A GENERATED LINKuseGlobalJS="false">
   /*
   This example is licensed under a 
   Creative Commons Attribution ShareAlike 4.0 International License.
   https://creativecommons.org/licenses/by-sa/4.0/
   
   Please note you have to mention 
   The Center of Mobile Learning with Digital Technology
   in the credits.
   */
   
   const board = JXG.JSXGraph.initBoard(BOARDID, {
       boundingbox: [-1, 5, 5, -1],
       axis: true
   });
   
   var radio = board.create('text', [0.5, 4, `
   <input type="radio" name="freq" value="1" onchange="change(this);" checked />1<br/>
   <input type="radio" name="freq" value="2" onchange="change(this);" />2<br/>
   <input type="radio" name="freq" value="3" onchange="change(this);" />3<br/>
   `], { fixed: true, frozen: true });
   
   radio.Value = function() {
       let opt = document.querySelector(`input[name=freq]:checked`);
       return opt = (opt != null) ? parseFloat(opt.value) : 1; // default value 1
   };
   
   // Update board on changing the radio button
   window.change = function(src) {
       board.update();
   }
   
   board.create('functiongraph', [
     function(x) {
           var r = radio.Value();
           return Math.sin(r * x) + 1;
     }
   ]);
</jsxgraph>

Radio button used in function graph

Calculus
Technical
This example shows how to use the value of a group of radio buttons in a function graph.
Have also a look at the examples 
// Define the id of your board in BOARDID

const board = JXG.JSXGraph.initBoard(BOARDID, {
    boundingbox: [-1, 5, 5, -1],
    axis: true
});

var radio = board.create('text', [0.5, 4, `
1

2

3

`], { fixed: true, frozen: true });

radio.Value = function() {
    let opt = document.querySelector(`input[name=freq]:checked`);
    return opt = (opt != null) ? parseFloat(opt.value) : 1; // default value 1
};

// Update board on changing the radio button
window.change = function(src) {
    board.update();
}

board.create('functiongraph', [
  function(x) {
        var r = radio.Value();
        return Math.sin(r * x) + 1;
  }
]);

license

This example is licensed under a Creative Commons Attribution ShareAlike 4.0 International License.
Please note you have to mention The Center of Mobile Learning with Digital Technology in the credits.