HTML_EDITOR Intro Page true true Designed by Fu-Kwun Hwang http://www.phy.ntnu.edu.tw/ntnujava/ ]]> 25 true VARIABLE_EDITOR coordinate true true range double xmin double xmax double ymin double ymax double t double dt double size double size2 double npt int vmax double g double double VARIABLE_EDITOR basic true true n int n0 int n1 int x double [n] y double [n] vx double [n] vy double [n] dx double [n] dy double [n] ax double [n] ay double [n] L double L2 double k double m double km double b double qcst double q double scale double double VARIABLE_EDITOR language true true l_play String l_pause String l_reset String l_init String label String l_step String l_tension String l_g String l_n String l_b String double CODE_EDITOR Init Page true true ODE_EDITOR ODE true true t dt vx[i] vy[i] ax[i]=getA(i,x,y,vx[i]) ay[i]=getA(i,y,x,vy[i])-g RungeKutta CODE_EDITOR Cons Page true true LIBRARY_EDITOR chinese true true LIBRARY_EDITOR playpause true true LIBRARY_EDITOR getA true true n0-1)return 0.; if(id==0){ r1=Math.sqrt((x[id]-x[n1])*(x[id]-x[n1])+(y[id]-y[n1])*(y[id]-y[n1])); r2=Math.sqrt((x[id]-x[id+1])*(x[id]-x[id+1])+(y[id]-y[id+1])*(y[id]-y[id+1])); a=km*(r1-L)*(x[n1]-x[id])/r1+km*(r2-L)*(x[id+1]-x[id])/r2; }else if(id==n1){ r1=Math.sqrt((x[id]-x[id-1])*(x[id]-x[id-1])+(y[id]-y[id-1])*(y[id]-y[id-1])); r2=Math.sqrt((x[id]-x[0])*(x[id]-x[0])+(y[id]-y[0])*(y[id]-y[0])); a=km*(r1-L)*(x[id-1]-x[id])/r1+km*(r2-L)*(x[0]-x[id])/r2; }else{ r1=Math.sqrt((x[id]-x[id-1])*(x[id]-x[id-1])+(y[id]-y[id-1])*(y[id]-y[id-1])); r2=Math.sqrt((x[id]-x[id+1])*(x[id]-x[id+1])+(y[id]-y[id+1])*(y[id]-y[id+1])); a= km*(r1-L)*(x[id-1]-x[id])/r1+km*(r2-L)*(x[id+1]-x[id])/r2; } for(int i=0;iL*L){ r3=r2*Math.sqrt(r2); a+=q*(x[id]-x[i])/r3; } } } return a-b*v; } ]]> true Elements.Frame Frame true true Elements.DrawingPanel DrawingPanel Frame center Elements.SpringSet SpringSet DrawingPanel Elements.ParticleSet ParticleSet DrawingPanel true Elements.Panel Panel Frame south true Elements.Panel Panel3 Panel Elements.Slider Slidern Panel3 Elements.Slider Sliderg Panel3 center Elements.Slider Sliderk Panel3 Elements.Slider Sliderb Panel3 false Elements.Panel Panel2 Panel Elements.Button reset Panel2 Elements.Button initialize Panel2 Elements.Button label Panel2