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Running
File size: 2,250 Bytes
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let display = document.getElementById('display');
let chart;
function appendValue(value) {
display.value += value;
}
function clearDisplay() {
display.value = '';
}
function calculate() {
try {
let expression = display.value;
let result = evaluateExpression(expression);
display.value = result;
} catch (error) {
display.value = 'Error';
}
}
function evaluateExpression(expression) {
// Basic implementation, more robust parsing needed for complex expressions
expression = expression.replace(/[^-()\d/*+.]/g, ''); // Remove invalid characters
expression = expression.replace(/(\d+\.\d+)/g, parseFloat); // clean floats
expression = expression.replace(/(\d+)/g, parseInt); // clean integers
try {
return new Function('return ' + expression)();
} catch (e) {
return 'Error';
}
}
function deleteLast() {
display.value = display.value.slice(0, -1);
}
function plotGraph() {
const equation = document.getElementById('equation').value;
const xValues = [];
const yValues = [];
for (let x = -10; x <= 10; x += 0.5) {
xValues.push(x);
try {
// Replace x in the equation and evaluate
let y = evaluateExpression(equation.replace(/x/g, x));
yValues.push(y);
} catch (error) {
alert("Invalid equation!");
return;
}
}
// Destroy previous chart if it exists
if (chart) {
chart.destroy();
}
const ctx = document.getElementById('myChart').getContext('2d');
chart = new Chart(ctx, {
type: 'line',
data: {
labels: xValues,
datasets: [{
label: equation,
data: yValues,
borderColor: 'blue',
fill: false
}]
},
options: {
scales: {
x: {
type: 'linear',
position: 'bottom'
},
y: {
type: 'linear',
position: 'left'
}
}
}
});
}
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