Init cdf weighting plot

assets/crps_learning/weights_plot/index.qmd

@@ -0,0 +1,202 @@
+---
+title: "Knots-Demo"
+date: 2025-07-10
+format:
+    revealjs:
+        embed-resources: true
+execute:
+  daemon: false
+highlight-style: github
+---
+
+
+```{ojs}
+d3 = require("d3@7")
+```
+
+```{ojs}
+bsplineData = FileAttachment("basis_functions.csv").csv({ typed: true })
+```
+
+```{ojs}
+function updateChartInner(g, x, y, linesGroup, color, line, data) {
+  // Update axes with transitions
+  x.domain(d3.extent(data, d => d.x));
+  g.select(".x-axis").transition().duration(1500).call(d3.axisBottom(x).ticks(10));
+  y.domain([0, d3.max(data, d => d.y)]);
+  g.select(".y-axis").transition().duration(1500).call(d3.axisLeft(y).ticks(5));
+
+  // Group data by basis function
+  const dataByFunction = Array.from(d3.group(data, d => d.b));
+  const keyFn = d => d[0];
+
+  // Update basis function lines
+  const u = linesGroup.selectAll("path").data(dataByFunction, keyFn);
+  u.join(
+    enter => enter.append("path").attr("fill","none").attr("stroke-width",3)
+      .attr("stroke", (_, i) => color(i)).attr("d", d => line(d[1].map(pt => ({x: pt.x, y: 0}))))
+      .style("opacity",0),
+    update => update,
+    exit => exit.transition().duration(1000).style("opacity",0).remove()
+  )
+  .transition().duration(1000)
+    .attr("d", d => line(d[1]))
+    .attr("stroke", (_, i) => color(i))
+    .style("opacity",1);
+}
+
+chart = {
+  // State variable for selected mu parameter
+  let selectedMu = 0.5;
+  
+  const filteredData = () => bsplineData.filter(d =>
+    Math.abs(selectedMu - d.mu) < 0.001
+  );
+  
+  const container = d3.create("div")
+    .style("max-width", "none")
+    .style("width", "100%");
+    
+  const controlsContainer = container.append("div")
+    .style("display", "flex")
+    .style("gap", "20px")
+    .style("align-items", "center");
+  
+  // Single slider control for mu
+  const sliderContainer = controlsContainer.append('div')
+    .style('display','flex')
+    .style('align-items','center')
+    .style('gap','10px')
+    .style('flex','1');
+    
+  sliderContainer.append('label')
+    .text('Naive:')
+    .style('font-size','20px');
+    
+  const muSlider = sliderContainer.append('input')
+    .attr('type','range')
+    .attr('min', 0)
+    .attr('max', 1)
+    .attr('step', 0.1)
+    .property('value', selectedMu)
+    .on('input', function(event) {
+      selectedMu = +this.value;
+      muDisplay.text(selectedMu.toFixed(1));
+      updateChart(filteredData());
+    })
+    .style('width', '100%');
+    
+  const muDisplay = sliderContainer.append('span')
+    .text(selectedMu.toFixed(1))
+    .style('font-size','20px');
+  
+  // Add Reset button
+  controlsContainer.append('button')
+    .text('Reset')
+    .style('font-size', '20px')
+    .style('align-self', 'center')
+    .style('margin-left', 'auto')
+    .on('click', () => {
+      selectedMu = 0.5;
+      muSlider.property('value', selectedMu);
+      muDisplay.text(selectedMu.toFixed(1));
+      updateChart(filteredData());
+    });
+
+   // Build SVG
+   const width = 1200;
+   const height = 450;
+   const margin = {top: 40, right: 20, bottom: 40, left: 40};
+   const innerWidth = width - margin.left - margin.right;
+   const innerHeight = height - margin.top - margin.bottom;
+
+   // Set controls container width to match SVG plot width
+   controlsContainer.style("max-width", "none").style("width", "100%");
+   // Distribute each control evenly and make sliders full-width
+   controlsContainer.selectAll("div").style("flex", "1").style("min-width", "0px");
+   controlsContainer.selectAll("input").style("width", "100%").style("box-sizing", "border-box");
+   
+   // Create scales
+   const x = d3.scaleLinear()
+     .range([0, innerWidth]);
+     
+   const y = d3.scaleLinear()
+     .range([innerHeight, 0]);
+   
+   // Create a color scale for the basis functions
+   const color = d3.scaleOrdinal(["#80C684FF", "#FFD44EFF", "#D81A5FFF"]);
+   
+   // Create SVG
+   const svg = d3.create("svg")
+     .attr("width", "100%")
+     .attr("height", "auto")
+     .attr("viewBox", [0, 0, width, height])
+     .attr("preserveAspectRatio", "xMidYMid meet")
+     .attr("style", "max-width: 100%; height: auto;");
+   
+   // Create the chart group
+   const g = svg.append("g")
+     .attr("transform", `translate(${margin.left},${margin.top})`);
+   
+   // Add axes
+   const xAxis = g.append("g")
+     .attr("transform", `translate(0,${innerHeight})`)
+     .attr("class", "x-axis")
+     .call(d3.axisBottom(x).ticks(10))
+     .style("font-size", "20px");
+   
+   const yAxis = g.append("g")
+     .attr("class", "y-axis")
+     .call(d3.axisLeft(y).ticks(5))
+     .style("font-size", "20px");
+   
+   // Add a horizontal line at y = 0
+   g.append("line")
+     .attr("x1", 0)
+     .attr("x2", innerWidth)
+     .attr("y1", y(0))
+     .attr("y2", y(0))
+     .attr("stroke", "#000")
+     .attr("stroke-opacity", 0.2);
+   
+   // Add gridlines
+   g.append("g")
+     .attr("class", "grid-lines")
+     .selectAll("line")
+     .data(y.ticks(5))
+     .join("line")
+     .attr("x1", 0)
+     .attr("x2", innerWidth)
+     .attr("y1", d => y(d))
+     .attr("y2", d => y(d))
+     .attr("stroke", "#ccc")
+     .attr("stroke-opacity", 0.5);
+   
+   // Create a line generator
+   const line = d3.line()
+     .x(d => x(d.x))
+     .y(d => y(d.y))
+     .curve(d3.curveBasis);
+   
+   // Group to contain the basis function lines
+   const linesGroup = g.append("g")
+     .attr("class", "basis-functions");
+   
+   // Store the current basis functions for transition
+   let currentBasisFunctions = new Map();
+   
+   // Function to update the chart with new data
+   function updateChart(data) {
+     updateChartInner(g, x, y, linesGroup, color, line, data);
+   }
+   
+   // Store the update function
+   svg.node().update = updateChart;
+   
+   // Initial render
+   updateChart(filteredData());
+   
+   container.node().appendChild(svg.node());
+   return container.node();
+}
+```