fcumsum([1, 1e-14, -1])
function fcumsum(values, valueof) {
const adder = new d3.Adder();
let index = -1;
return Float64Array.from(values, valueof === undefined
? v => adder.add(+v || 0)
: v => adder.add(+valueof(v, ++index, values) || 0)
);
}
fcumsum([1, 2, 3])
fcumsum(data, d => d.value)
d3.cumsum(data, d => d.value)
fcumsum(["1", null, 0.1, "0.1", 0.1, "a", undefined, "5e-1"]) // 1…1.8
d3.cumsum(["1", null, 0.1, "0.1", 0.1, "a", undefined, "5e-1"])
data = [
{ value: 18.7 },
{ value: 14.3 },
{ value: 16.4 },
{ value: 17.3 },
{ value: 15.2 },
{ value: 10.4 },
{ value: 10.4 },
{ value: 14.7 },
{ value: 15.5 },
{ value: 15.2 },
{ value: 13.3 },
{ value: 19.2 }
]
// d3.fcumsum was introduced in d3-array@2.x
d3 = require("d3-array@2") // ^next
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
