simple-squiggle

A restricted subset of Squiggle
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basic_usage.js (1412B)

      1 // basic usage
      2 
      3 // load math.js (using node.js)
      4 const math = require('..')
      5 
      6 // functions and constants
      7 console.log('functions and constants')
      8 print(math.round(math.e, 3)) // 2.718
      9 print(math.atan2(3, -3) / math.pi) // 0.75
     10 print(math.log(10000, 10)) // 4
     11 print(math.sqrt(-4)) // 2i
     12 print(math.pow([[-1, 2], [3, 1]], 2)) // [[7, 0], [0, 7]]
     13 print(math.derivative('x^2 + x', 'x')) // 2 * x + 1
     14 console.log()
     15 
     16 // expressions
     17 console.log('expressions')
     18 print(math.evaluate('1.2 * (2 + 4.5)')) // 7.8
     19 print(math.evaluate('12.7 cm to inch')) // 5 inch
     20 print(math.evaluate('sin(45 deg) ^ 2')) // 0.5
     21 print(math.evaluate('9 / 3 + 2i')) // 3 + 2i
     22 print(math.evaluate('det([-1, 2; 3, 1])')) // -7
     23 console.log()
     24 
     25 // chained operations
     26 console.log('chained operations')
     27 const a = math.chain(3)
     28   .add(4)
     29   .multiply(2)
     30   .done()
     31 print(a) // 14
     32 console.log()
     33 
     34 // mixed use of different data types in functions
     35 console.log('mixed use of data types')
     36 print(math.add(4, [5, 6])) // number + Array, [9, 10]
     37 print(math.multiply(math.unit('5 mm'), 3)) // Unit * number,  15 mm
     38 print(math.subtract([2, 3, 4], 5)) // Array - number, [-3, -2, -1]
     39 print(math.add(math.matrix([2, 3]), [4, 5])) // Matrix + Array, [6, 8]
     40 console.log()
     41 
     42 /**
     43  * Helper function to output a value in the console. Value will be formatted.
     44  * @param {*} value
     45  */
     46 function print (value) {
     47   const precision = 14
     48   console.log(math.format(value, precision))
     49 }