algebra.js (1283B)
1 // algebra 2 // 3 // math.js has support for symbolic computation (CAS). It can parse 4 // expressions in an expression tree and do algebraic operations like 5 // simplification and derivation on this tree. 6 7 // load math.js (using node.js) 8 const { simplify, parse, derivative } = require('..') 9 10 // simplify an expression 11 console.log('simplify expressions') 12 console.log(simplify('3 + 2 / 4').toString()) // '7 / 2' 13 console.log(simplify('2x + 3x').toString()) // '5 * x' 14 console.log(simplify('2 * 3 * x', { x: 4 }).toString()) // '24' 15 console.log(simplify('x^2 + x + 3 + x^2').toString()) // '2 * x ^ 2 + x + 3' 16 console.log(simplify('x * y * -x / (x ^ 2)').toString()) // '-y' 17 18 // work with an expression tree, evaluate results 19 const f = parse('2x + x') 20 const simplified = simplify(f) 21 console.log(simplified.toString()) // '3 * x' 22 console.log(simplified.evaluate({ x: 4 })) // 12 23 console.log() 24 25 // calculate a derivative 26 console.log('calculate derivatives') 27 console.log(derivative('2x^2 + 3x + 4', 'x').toString()) // '4 * x + 3' 28 console.log(derivative('sin(2x)', 'x').toString()) // '2 * cos(2 * x)' 29 30 // work with an expression tree, evaluate results 31 const h = parse('x^2 + x') 32 const dh = derivative(h, 'x') 33 console.log(dh.toString()) // '2 * x + 1' 34 console.log(dh.evaluate({ x: 3 })) // '7'