d3js create a force layout with fixed nodes [closed]

Answer 1

the solution is simple insert into the nodes object x,y coordinates and fixed:true like this

{ name: "Sara", id:"1", x:239.31191418045182, y:296.78520431471384, fixed:true},
{ name: "Raul", id:"2", x:261.1651006560272, y:200.78448049334696, fixed:true},
{ name: "Stefano", id:"3", fixed:false},
{ name: "Michele", id:"4", fixed:false}

this is a working example http://jsbin.com/omokap/8/edit please add yourself d3js library.

for my purpose works fine.