d3.zoomIdentity The identity transform, where k = 1, tx = ty = 0.

d3.zoom() Creates a new zoom behavior. The returned behavior, zoom, is both an object and a function, and is typically applied to selected elements via selection.call.

d3.zip(arrays…) Returns an array of arrays, where the ith array contains the ith element from each of the argument arrays. The returned array is truncated in length to the shortest array in arrays. If arrays contains only a single array, the returned array contains one-element arrays. With no arguments, the returned array is empty. d3.zip([1, 2], [3, 4]); // returns [[1, 3], [2, 4]]

d3.xml(url[, callback]) Creates a request for the XML file at the specified url with the default mime type application/xml. This convenience constructor is approximately equivalent to: d3.request(url) .mimeType("application/xml") .response(function(xhr) { return xhr.responseXML; }) .get(callback); XML parsing relies on xhr.responseXML which is not supported by node-XMLHttpRequest as of version 1.8; thus, this method is supported in browsers but not in Node.

d3.window(node) Returns the owner window for the specified node. If node is a node, returns the owner document’s default view; if node is a document, returns its default view; otherwise returns the node.

d3.voronoi() Creates a new Voronoi layout with default x- and y- accessors and a null extent.

d3.variance(array[, accessor]) Returns an unbiased estimator of the population variance of the given array of numbers. If the array has fewer than two values, returns undefined. An optional accessor function may be specified, which is equivalent to calling array.map(accessor) before computing the variance. This method ignores undefined and NaN values; this is useful for ignoring missing data.

d3.values(object) Returns an array containing the property values of the specified object (an associative array). The order of the returned array is undefined.

d3.utcParse(specifier) An alias for locale.utcParse on the default locale.

d3.utcFormat(specifier) An alias for locale.utcFormat on the default locale.