Difference between revisions of "Cubic spline interpolation"

From JSXGraph Wiki
Jump to navigationJump to search
Line 21: Line 21:
 
         p[3] = board.createElement('point', [2,1], {style:6});
 
         p[3] = board.createElement('point', [2,1], {style:6});
  
−
        function computeSpline() {
+
         var c = board.createElement('spline', p, {strokeWidth:3});
−
          var x = [];
 
−
          var y = [];
 
−
          for (var i=0;i<p.length;i++) {
 
−
            x[i] = p[i].X();
 
−
            y[i] = p[i].Y();
 
−
          }
 
−
          var F = JXG.Math.Numerics.splineDef(x, y);
 
−
          /*
 
−
          var px = [];
 
−
          i = 0;
 
−
          var delta = (x[x.length-1]-x[0])/board.canvasWidth*1.0;
 
−
          while(x[0] + i*delta < x[x.length-1]) {
 
−
            px[i] = x[0] + i*delta;
 
−
            i++;
 
−
          }
 
−
          var py = JXG.Math.Numerics.splineEval(px, x, y, F);
 
−
          */
 
−
          return F; // ?????
 
−
          return [px,py]; // ?????
 
−
        }         
 
−
 
 
−
         var c = board.createElement('curve', ["x",computeSpline(),"x"], {strokeWidth:3});
 
  
 
         function addPoint() {
 
         function addPoint() {

Revision as of 20:04, 7 December 2008

Under Construction -- NOT YET WORKING

Constructs a cubic spline through given points. Points can be added by clicking on "Add point". 

        function addPoint() {
          p.push(board.createElement('point',[(Math.random()-0.5)*10,(Math.random()-0.5)*3],{style:6}));
          board.update();
        }
Retrieved from "http://jsxgraph.org/wiki/index.php?title=Cubic_spline_interpolation&oldid=435"