Difference between revisions of "Matrix multiplication II"

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</jsxgraph>
 
</jsxgraph>
 +
 +
=== The underlying JavaScript code ===
 +
 +
<source lang="javascript">
 +
  var b1 = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-10,10,10,-10], axis:true});
 +
  b1.suspendUpdate();
 +
  var a = b1.create('slider',[[-5,-2],[5,-2],[-5,1,5]],{name:'a', snapWidth:0.1});
 +
  var b = b1.create('slider',[[-5,-3],[5,-3],[-5,0,5]],{name:'b', snapWidth:0.1});
 +
  var c = b1.create('slider',[[-5,-4],[5,-4],[-5,0,5]],{name:'c', snapWidth:0.1});
 +
  var d = b1.create('slider',[[-5,-5],[5,-5],[-5,1,5]],{name:'d', snapWidth:0.1});
 +
 +
  var v = b1.create('point',[2,2],{style:5,name:'v'});
 +
  var va = b1.create('arrow',[[0,0],v]);
 +
 +
  var v2 = b1.create('point',[
 +
      function() {return a.Value()*v.X()+b.Value()*v.Y();},
 +
      function() {return c.Value()*v.X()+d.Value()*v.Y();}],{style:7,name:"v'"});
 +
  var va2 = b1.create('arrow',[[0,0],v2],{color:'black', strokeWidth:1});
 +
 +
  var t = b1.create('text',[-8,5,function(){ return 'Matrix=<br>|'+b1.round(a.Value(),2)+' '+b1.round(b.Value(),2)+'|'+'<br>'+'|'+b1.round(c.Value(),2)+' '+b1.round(d.Value(),2)+'|';}]);
 +
  b1.unsuspendUpdate();
 +
 +
  var t2 = b1.create('text',[-8,1,
 +
              function(){ return "&lambda; = |v'|/|v| = "
 +
                + b1.round(
 +
                    JXG.Math.Geometry.distance([0,0],[v2.X(),v2.Y()])/
 +
                    JXG.Math.Geometry.distance([0,0],[v.X(),v.Y()]), 3
 +
                  );}]);
 +
  b1.unsuspendUpdate();
 +
 +
</source>
 +
  
 
[[Category:Examples]]
 
[[Category:Examples]]

Revision as of 08:59, 25 March 2011

The underlying JavaScript code

  var b1 = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-10,10,10,-10], axis:true});
  b1.suspendUpdate();
  var a = b1.create('slider',[[-5,-2],[5,-2],[-5,1,5]],{name:'a', snapWidth:0.1});
  var b = b1.create('slider',[[-5,-3],[5,-3],[-5,0,5]],{name:'b', snapWidth:0.1});
  var c = b1.create('slider',[[-5,-4],[5,-4],[-5,0,5]],{name:'c', snapWidth:0.1});
  var d = b1.create('slider',[[-5,-5],[5,-5],[-5,1,5]],{name:'d', snapWidth:0.1});

  var v = b1.create('point',[2,2],{style:5,name:'v'});
  var va = b1.create('arrow',[[0,0],v]);

  var v2 = b1.create('point',[
       function() {return a.Value()*v.X()+b.Value()*v.Y();},
       function() {return c.Value()*v.X()+d.Value()*v.Y();}],{style:7,name:"v'"});
  var va2 = b1.create('arrow',[[0,0],v2],{color:'black', strokeWidth:1});

  var t = b1.create('text',[-8,5,function(){ return 'Matrix=<br>|'+b1.round(a.Value(),2)+' '+b1.round(b.Value(),2)+'|'+'<br>'+'|'+b1.round(c.Value(),2)+' '+b1.round(d.Value(),2)+'|';}]);
  b1.unsuspendUpdate();

  var t2 = b1.create('text',[-8,1,
               function(){ return "&lambda; = |v'|/|v| = " 
                 + b1.round(
                     JXG.Math.Geometry.distance([0,0],[v2.X(),v2.Y()])/
                     JXG.Math.Geometry.distance([0,0],[v.X(),v.Y()]), 3
                   );}]);
  b1.unsuspendUpdate();