50 lines
1.4 KiB
JavaScript
50 lines
1.4 KiB
JavaScript
// basic usage
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// load math.js (using node.js)
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const math = require('..')
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// functions and constants
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console.log('functions and constants')
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print(math.round(math.e, 3)) // 2.718
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print(math.atan2(3, -3) / math.pi) // 0.75
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print(math.log(10000, 10)) // 4
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print(math.sqrt(-4)) // 2i
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print(math.pow([[-1, 2], [3, 1]], 2)) // [[7, 0], [0, 7]]
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print(math.derivative('x^2 + x', 'x')) // 2 * x + 1
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console.log()
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// expressions
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console.log('expressions')
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print(math.evaluate('1.2 * (2 + 4.5)')) // 7.8
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print(math.evaluate('12.7 cm to inch')) // 5 inch
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print(math.evaluate('sin(45 deg) ^ 2')) // 0.5
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print(math.evaluate('9 / 3 + 2i')) // 3 + 2i
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print(math.evaluate('det([-1, 2; 3, 1])')) // -7
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console.log()
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// chained operations
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console.log('chained operations')
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const a = math.chain(3)
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.add(4)
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.multiply(2)
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.done()
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print(a) // 14
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console.log()
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// mixed use of different data types in functions
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console.log('mixed use of data types')
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print(math.add(4, [5, 6])) // number + Array, [9, 10]
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print(math.multiply(math.unit('5 mm'), 3)) // Unit * number, 15 mm
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print(math.subtract([2, 3, 4], 5)) // Array - number, [-3, -2, -1]
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print(math.add(math.matrix([2, 3]), [4, 5])) // Matrix + Array, [6, 8]
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console.log()
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/**
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* Helper function to output a value in the console. Value will be formatted.
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* @param {*} value
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*/
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function print (value) {
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const precision = 14
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console.log(math.format(value, precision))
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}
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