d3.interpolateMagma(t) Given a number t in the range [0,1], returns the corresponding color from the “magma” perceptually-uniform color scheme designed by van der Walt and Smith for matplotlib, represented as an RGB string.

transition.attr(name, value) For each selected element, assigns the attribute tween for the attribute with the specified name to the specified target value. The starting value of the tween is the attribute’s value when the transition starts. The target value may be specified either as a constant or a function. If a function, it is immediately 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. If the t

d3.interpolatePRGn(t) d3.schemePRGn Given a number t in the range [0,1], returns the corresponding color from the “PRGn” diverging color scheme represented as an RGB string.

d3.geoProjection(project) Constructs a new projection from the specified raw projection, project. The project function takes the longitude and latitude of a given point in radians, often referred to as lambda (λ) and phi (φ), and returns a two-element array [x, y] representing its unit projection. The project function does not need to scale or translate the point, as these are applied automatically by projection.scale, projection.translate, and projection.center. Likewise, the project functio

projection.fitExtent(extent, object) Sets the projection’s scale and translate to fit the specified GeoJSON object in the center of the given extent. The extent is specified as an array [[x₀, y₀], [x₁, y₁]], where x₀ is the left side of the bounding box, y₀ is the top, x₁ is the right and y₁ is the bottom. Returns the projection. For example, to scale and translate the New Jersey State Plane projection to fit a GeoJSON object nj in the center of a 960×500 bounding box with 20 pixels of paddi

stream.point(x, y[, z]) Indicates a point with the specified coordinates x and y (and optionally z). The coordinate system is unspecified and implementation-dependent; for example, projection streams require spherical coordinates in degrees as input. Outside the context of a polygon or line, a point indicates a point geometry object (Point or MultiPoint). Within a line or polygon ring, the point indicates a control point.

request.send(method[, data][, callback]) Issues this request using the specified method (such as GET or POST), optionally posting the specified data in the request body, and returns this request instance. If a callback is specified, the callback will be invoked asynchronously when the request succeeds or fails. The callback is invoked with two arguments: the error, if any, and the response value. The response value is undefined if an error occurs. This is equivalent to: request .on("erro

brush.filter([filter]) If filter is specified, sets the filter to the specified function and returns the brush. If filter is not specified, returns the current filter, which defaults to: function filter() { return !event.button; } If the filter returns falsey, the initiating event is ignored and no brush gesture is started. Thus, the filter determines which input events are ignored. The default filter ignores mousedown events on secondary buttons, since those buttons are typically intended

d3.csv(url[[, row], callback]) Creates a request for the CSV file at the specified url with the default mime type text/csv. An optional row conversion function may be specified to map and filter row objects to a more-specific representation; see dsv.parse for details. For example: function row(d) { return { year: new Date(+d.Year, 0, 1), // convert "Year" column to Date make: d.Make, model: d.Model, length: +d.Length // convert "Length" column to number }; } The row conver

d3.geoCentroid(feature) Returns the spherical centroid of the specified GeoJSON feature. See also path.centroid, which computes the projected planar centroid.