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78 lines (66 loc) · 1.53 KB
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>math.js | plot</title>
<script src="../../lib/browser/math.js"></script>
<script src="https://cdn.plot.ly/plotly-1.35.2.min.js"></script>
<style>
input[type=text] {
width: 300px;
}
input {
padding: 6px;
}
body, html, input {
font-family: sans-serif;
font-size: 11pt;
}
form {
margin: 20px 0;
}
</style>
</head>
<body>
<form id="form">
<label for="eq">Enter an equation:</label>
<input type="text" id="eq" value="4 * sin(x) + 5 * cos(x/2)" />
<input type="submit" value="Draw" />
</form>
<div id="plot"></div>
<p>
Used plot library: <a href="https://plot.ly/javascript/">Plotly</a>
</p>
<script>
function draw() {
try {
// compile the expression once
const expression = document.getElementById('eq').value
const expr = math.compile(expression)
// evaluate the expression repeatedly for different values of x
const xValues = math.range(-10, 10, 0.5).toArray()
const yValues = xValues.map(function (x) {
return expr.evaluate({x: x})
})
// render the plot using plotly
const trace1 = {
x: xValues,
y: yValues,
type: 'scatter'
}
const data = [trace1]
Plotly.newPlot('plot', data)
}
catch (err) {
console.error(err)
alert(err)
}
}
document.getElementById('form').onsubmit = function (event) {
event.preventDefault()
draw()
}
draw()
</script>
</body>
</html>