79 lines
1.5 KiB
HTML
79 lines
1.5 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>math.js | plot</title>
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<script src="../../lib/browser/math.js"></script>
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<script src="https://cdn.plot.ly/plotly-1.35.2.min.js"></script>
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<style>
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input[type=text] {
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width: 300px;
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}
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input {
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padding: 6px;
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}
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body, html, input {
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font-family: sans-serif;
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font-size: 11pt;
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}
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form {
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margin: 20px 0;
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}
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</style>
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</head>
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<body>
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<form id="form">
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<label for="eq">Enter an equation:</label>
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<input type="text" id="eq" value="4 * sin(x) + 5 * cos(x/2)" />
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<input type="submit" value="Draw" />
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</form>
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<div id="plot"></div>
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<p>
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Used plot library: <a href="https://plot.ly/javascript/">Plotly</a>
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</p>
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<script>
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function draw() {
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try {
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// compile the expression once
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const expression = document.getElementById('eq').value
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const expr = math.compile(expression)
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// evaluate the expression repeatedly for different values of x
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const xValues = math.range(-10, 10, 0.5).toArray()
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const yValues = xValues.map(function (x) {
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return expr.evaluate({x: x})
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})
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// render the plot using plotly
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const trace1 = {
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x: xValues,
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y: yValues,
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type: 'scatter'
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}
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const data = [trace1]
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Plotly.newPlot('plot', data)
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}
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catch (err) {
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console.error(err)
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alert(err)
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}
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}
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document.getElementById('form').onsubmit = function (event) {
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event.preventDefault()
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draw()
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}
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draw()
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</script>
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</body>
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</html>
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