y.y([y]) If y is specified, sets the y-coordinate accessor to the specified number or function, re-evaluates

collide.radius([radius]) If radius is specified, sets the radius accessor to the specified number or function

simulation.force(name[, force]) If force is specified, assigns the

link.iterations([iterations]) If iterations is specified, sets the number of iterations per application to

center.x([x]) If x is specified, sets the x-coordinate of the centering position to the specified

simulation.restart() Restarts the simulation’s internal timer and returns the simulation. In conjunction with

collide.strength([strength]) If strength is specified, sets the force strength to the specified number in the

d3.forceX([x]) Creates a new positioning force along the x-axis towards the given position

d3.forceLink([links]) Creates a new link force with the specified links and default parameters. If links is

simulation.nodes([nodes]) If nodes is specified, sets the simulation’s nodes to the specified array of objects