axis.ticks(arguments…) axis.ticks([count[, specifier]]) axis.ticks([interval[, specifier]]) Sets the arguments that will be passed to scale.ticks and scale.tickFormat when the axis is rendered, and returns the axis generator. The meaning of the arguments depends on the axis’ scale type: most commonly, the arguments are a suggested count for the number of ticks (or a time interval for time scales), and an optional format specifier to customize how the tick values are formatted. For example, to

d3.treemapSlice(node, x0, y0, x1, y1) Divides the rectangular area specified by x0, y0, x1, y1 vertically according the value of each of the specified node’s children. The children are positioned in order, starting with the top edge (y0) of the given rectangle. If the sum of the children’s values is less than the specified node’s value (i.e., if the specified node has a non-zero internal value), the remaining empty space will be positioned on the bottom edge (y1) of the given rectangle.

d3.stack() Constructs a new stack generator with the default settings.

d3.bisector(accessor) d3.bisector(comparator) Returns a new bisector using the specified accessor or comparator function. This method can be used to bisect arrays of objects instead of being limited to simple arrays of primitives. For example, given the following array of objects: var data = [ {date: new Date(2011, 1, 1), value: 0.5}, {date: new Date(2011, 2, 1), value: 0.6}, {date: new Date(2011, 3, 1), value: 0.7}, {date: new Date(2011, 4, 1), value: 0.8} ]; A suitable bisect func

interpolate.gamma(gamma) Given that interpolate is one of interpolateRgb, interpolateCubehelix or interpolateCubehelixLong, returns a new interpolator factory of the same type using the specified gamma. For example, to interpolate from purple to orange with a gamma of 2.2 in RGB space: var interpolator = d3.interpolateRgb.gamma(2.2)("purple", "orange"); See Eric Brasseur’s article, Gamma error in picture scaling, for more on gamma correction.

stratify.id([id]) If id is specified, sets the id accessor to the given function and returns this stratify operator. Otherwise, returns the current id accessor, which defaults to: function id(d) { return d.id; } The id accessor is invoked for each element in the input data passed to the stratify operator, being passed the current datum (d) and the current index (i). The returned string is then used to identify the node’s relationships in conjunction with the parent id. For leaf nodes, the

dsv.format(rows[, columns]) Formats the specified array of object rows as delimiter-separated values, returning a string. This operation is the inverse of dsv.parse. Each row will be separated by a newline (\n), and each column within each row will be separated by the delimiter (such as a comma, ,). Values that contain either the delimiter, a double-quote (") or a newline will be escaped using double-quotes. If columns is not specified, the list of column names that forms the header row is d

d3.quantile(array, p[, accessor]) Returns the p-quantile of the given sorted array of numbers, where p is a number in the range [0, 1]. For example, the median can be computed using p = 0.5, the first quartile at p = 0.25, and the third quartile at p = 0.75. This particular implementation uses the R-7 method, which is the default for the R programming language and Excel. For example: var a = [0, 10, 30]; d3.quantile(a, 0); // 0 d3.quantile(a, 0.5); // 10 d3.quantile(a, 1); // 30 d3.quantile(a

d3.geoGringortenQuincuncial() The Gringorten square equal-area projection.

d3.geoAlbers() Alber’s equal-area conic projection; see d3-geo.