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Linear Regression Calculator

setInputData(e.target.value)}\n        rows={10}\n        style={{ width: '100%', marginBottom: '10px' }}\n      />\n      <button onClick={handleCalculate}>Calculate Regression</button>\n      \n      {result.slope !== undefined && result.intercept !== undefined && (\n        <div style={{ marginTop: '20px' }}>\n          <h2>Regression Results</h2>\n          <p>Slope (m): {result.slope.toFixed(4)}</p>\n          <p>Y-Intercept (b): {result.intercept.toFixed(4)}</p>\n          <p>Equation: y = {result.slope.toFixed(4)}x + {result.intercept.toFixed(4)}</p>\n        </div>\n      )}\n      <a \n        href={import.meta.url.replace(\"esm.town\", \"val.town\")} \n        target=\"_top\" \n        style={{ \n          display: 'block', \n          marginTop: '20px', \n          color: '#666', \n          textDecoration: 'none' \n        }}\n      >\n        View Source\n      </a>\n    </div>\n  );\n}\n\nfunction client() {\n  createRoot(document.getElementById(\"root\")).render(<App />);\n}\nif (typeof document !== \"undefined\") { client(); }\n\nexport default async function server(request: Request): Promise<Response> {\n  return new Response(`\n    <html>\n      <head>\n        <title>Linear Regression Calculator</title>\n        <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\n      </head>\n      <body>\n        <div id=\"root\"></div>\n        <script src=\"https://esm.town/v/std/catch\"></script>\n        <script type=\"module\" src=\"${import.meta.url}\"></script>\n      </body>\n    </html>\n  `, {\n    headers: {\n      \"content-type\": \"text/html\",\n    },\n  });\n}","/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport React, { useState } from \"https://esm.sh/react@18.2.0\";\nimport { createRoot } from \"https://esm.sh/react-dom@18.2.0/client\";\n\nfunction linearRegression(x: number[], y: number[]) {\n  const n = x.length;\n  \n  // Calculate means\n  const meanX = x.reduce((a, b) => a + b, 0) / n;\n  const meanY = y.reduce((a, b) => a + b, 0) / n;\n\n  // Calculate slope (m)\n  const numerator = x.reduce((sum, xi, i) => sum + (xi - meanX) * (y[i] - meanY), 0);\n  const denominator = x.reduce((sum, xi) => sum + Math.pow(xi - meanX, 2), 0);\n  \n  const slope = numerator / denominator;\n  \n  // Calculate y-intercept (b)\n  const intercept = meanY - slope * meanX;\n\n  return { slope, intercept };\n}\n\nfunction App() {\n  const [inputData, setInputData] = useState('');\n  const [result, setResult] = useState<{ slope?: number; intercept?: number }>({});\n\n  const handleCalculate = async () => {\n    try {\n      const lines = inputData.trim().split('\\n');\n      const x: number[] = [];\n      const y: number[] = [];\n\n      lines.forEach(line => {\n        // Split on multiple whitespace or comma, then trim each value\n        const values = line.split(/[\\s,\\t]+/).map(val => val.trim());\n        \n        // Ensure we have exactly two values that can be parsed to numbers\n        if (values.length >= 2) {\n          const xVal = parseFloat(values[0]);\n          const yVal = parseFloat(values[1]);\n          \n          if (!isNaN(xVal) && !isNaN(yVal)) {\n            x.push(xVal);\n            y.push(yVal);\n          }\n        }\n      });\n\n      if (x.length === 0) {\n        throw new Error('No valid data points');\n      }\n\n      const regression = linearRegression(x, y);\n      setResult(regression);\n    } catch (error) {\n      console.error('Calculation error', error);\n      setResult({});\n      alert(error instanceof Error ? error.message : 'Error calculating regression');\n    }\n  };\n\n  return (\n    <div style={{ \n      maxWidth: '600px', \n      margin: 'auto', \n      padding: '20px', \n      fontFamily: 'Arial, sans-serif' \n    }}>\n      <h1>Linear Regression Calculator</h1>\n      <textarea \n        placeholder=\"Enter data points (x y) one per line\nSupports: \n- 1, 2\n- 1 2\n- 1   2\n- 1\t2\"\n        value={inputData}\n        onChange={(e) => setInputData(e.target.value)}\n        rows={10}\n        style={{ width: '100%', marginBottom: '10px' }}\n      />\n      <button onClick={handleCalculate}>Calculate Regression</button>\n      \n      {result.slope !== undefined && result.intercept !== undefined && (\n        <div style={{ marginTop: '20px' }}>\n          <h2>Regression Results</h2>\n          <p>Slope (m): {result.slope.toFixed(4)}</p>\n          <p>Y-Intercept (b): {result.intercept.toFixed(4)}</p>\n          <p>Equation: y = {result.slope.toFixed(4)}x + {result.intercept.toFixed(4)}</p>\n        </div>\n      )}\n      <a \n        href={import.meta.url.replace(\"esm.town\", \"val.town\")} \n        target=\"_top\" \n        style={{ \n          display: 'block', \n          marginTop: '20px', \n          color: '#666', \n          textDecoration: 'none' \n        }}\n      >\n        View Source\n      </a>\n    </div>\n  );\n}\n\nfunction client() {\n  createRoot(document.getElementById(\"root\")).render(<App />);\n}\nif (typeof document !== \"undefined\") { client(); 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Diff · v2