chart = {
// Declare the chart dimensions and margins.
const width = 928;
const height = 500;
const marginTop = 30;
const marginRight = 0;
const marginBottom = 30;
const marginLeft = 40;
// Declare the x (horizontal position) scale.
const x = d3.scaleBand()
.domain(d3.groupSort(data, ([d]) => -d.frequency, (d) => d.letter)) // descending frequency
.range([marginLeft, width - marginRight])
.padding(0.1);
// Declare the y (vertical position) scale.
const y = d3.scaleLinear()
.domain([0, d3.max(data, (d) => d.frequency)])
.range([height - marginBottom, marginTop]);
// Create the SVG container.
const svg = d3.create("svg")
.attr("width", width)
.attr("height", height)
.attr("viewBox", [0, 0, width, height])
.attr("style", "max-width: 100%; height: auto;");
// Add a rect for each bar.
svg.append("g")
.attr("fill", "purple")
.selectAll()
.data(data)
.join("rect")
.attr("x", (d) => x(d.letter))
.attr("y", (d) => y(d.frequency))
.attr("height", (d) => y(0) - y(d.frequency))
.attr("width", x.bandwidth());
// Add the x-axis and label.
svg.append("g")
.attr("transform", `translate(0,${height - marginBottom})`)
.call(d3.axisBottom(x).tickSizeOuter(0));
// Add the y-axis and label, and remove the domain line.
svg.append("g")
.attr("transform", `translate(${marginLeft},0)`)
.call(d3.axisLeft(y).tickFormat((y) => (y * 100).toFixed()))
.call(g => g.select(".domain").remove())
.call(g => g.append("text")
.attr("x", -marginLeft)
.attr("y", 10)
.attr("fill", "currentColor")
.attr("text-anchor", "start")
.text("↑ Frequency (%)"));
// Return the SVG element.
return svg.node();
}
data = FileAttachment("query.csv").csv({typed: "auto"})
Plot.plot({
y: {percent: true},
marks: [
Plot.barY(data, {x: "letter", y: "frequency", fill: "steelblue", sort: {x: "-y"}}),
Plot.ruleY([0])
]
})
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.
