continuous.invert(value) Given a value from the range, returns the corresponding value from the domain. Inversion is useful for interaction, say to determine the data value corresponding to the position of the mouse. For example, to invert a position encoding: var x = d3.scaleLinear() .domain([10, 130]) .range([0, 960]); x.invert(80); // 20 x.invert(320); // 50 If the given value is outside the range, and clamping is not enabled, the mapping may be extrapolated such that the returne

selection.transition([name]) Returns a new transition on the given selection with the specified name. If a name is not specified, null is used. The new transition is only exclusive with other transitions of the same name. If the name is a transition instance, the returned transition has the same id and name as the specified transition. If a transition with the same id already exists on a selected element, the existing transition is returned for that element. Otherwise, the timing of the retu

transition.selectAll(selector) For each selected element, selects all descendant elements that match the specified selector string, if any, and returns a transition on the resulting selection. The selector may be specified either as a selector string or a function. If a function, it is evaluated for each selected element, in order, being passed the current datum d and index i, with the this context as the current DOM element. The new transition has the same id, name and timing as this transi

d3.median(array[, accessor]) Returns the median of the given array of numbers using the R-7 method. If the array is empty, returns undefined. An optional accessor function may be specified, which is equivalent to calling array.map(accessor) before computing the median. This method ignores undefined and NaN values; this is useful for ignoring missing data.

area.y1([y]) If y is specified, sets the y1 accessor to the specified function or number and returns this area generator. If y is not specified, returns the current y1 accessor, which defaults to: function y(d) { return d[1]; } A null accessor is also allowed, indicating that the previously-computed y0 value should be reused for the y1 value. When an area is generated, the y1 accessor will be invoked for each defined element in the input data array, being passed the element d, the index i,

histogram.domain([domain]) If domain is specified, sets the domain accessor to the specified function or array and returns this histogram generator. If domain is not specified, returns the current domain accessor, which defaults to extent. The histogram domain is defined as an array [min, max], where min is the minimum observable value and max is the maximum observable value; both values are inclusive. Any value outside of this domain will be ignored when the histogram is generated. For exam

x.strength([strength]) If strength is specified, sets the strength accessor to the specified number or function, re-evaluates the strength accessor for each node, and returns this force. The strength determines how much to increment the node’s x-velocity: (x - node.x) × strength. For example, a value of 0.1 indicates that the node should move a tenth of the way from its current x-position to the target x-position with each application. Higher values moves nodes more quickly to the target pos

link.links([links]) If links is specified, sets the array of links associated with this force, recomputes the distance and strength parameters for each link, and returns this force. If links is not specified, returns the current array of links, which defaults to the empty array. Each link is an object with the following properties: source - the link’s source node; see simulation.nodes target - the link’s target node; see simulation.nodes index - the zero-based index into links, assigned

d3.randomUniform([min, ][max]) Returns a function for generating random numbers with a uniform distribution. The minimum allowed value of a returned number is min, and the maximum is max. If min is not specified, it defaults to 0; if max is not specified, it defaults to 1. For example: d3.randomUniform(6)(); // Returns a number greater than or equal to 0 and less than 6. d3.randomUniform(1, 5)(); // Returns a number greater than or equal to 1 and less than 5. Note that you can also use the bu

pie.startAngle([angle]) If angle is specified, sets the overall start angle of the pie to the specified function or number and returns this pie generator. If angle is not specified, returns the current start angle accessor, which defaults to: function startAngle() { return 0; } The start angle here means the overall start angle of the pie, i.e., the start angle of the first arc. The start angle accessor is invoked once, being passed the same arguments and this context as the pie generator.