mathjs/examples/bignumbers.js at develop · Dionuta/mathjs · GitHub

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// BigNumbers

// load math.js (using node.js)

const math = require('../index')

// configure the default type of numbers as BigNumbers

math.config({

number: 'BigNumber', // Default type of number:

// 'number' (default), 'BigNumber', or 'Fraction'

precision: 20 // Number of significant digits for BigNumbers

})

console.log('round-off errors with numbers')

print(math.add(0.1, 0.2)) // number, 0.30000000000000004

print(math.divide(0.3, 0.2)) // number, 1.4999999999999998

console.log()

console.log('no round-off errors with BigNumbers')

print(math.add(math.bignumber(0.1), math.bignumber(0.2))) // BigNumber, 0.3

print(math.divide(math.bignumber(0.3), math.bignumber(0.2))) // BigNumber, 1.5

console.log()

console.log('create BigNumbers from strings when exceeding the range of a number')

print(math.bignumber(1.2e+500)) // BigNumber, Infinity WRONG

print(math.bignumber('1.2e+500')) // BigNumber, 1.2e+500

console.log()

console.log('BigNumbers still have a limited precision and are no silve bullet')

const third = math.divide(math.bignumber(1), math.bignumber(3))

const total = math.add(third, third, third)

print(total) // BigNumber, 0.99999999999999999999

console.log()

// one can work conveniently with BigNumbers using the expression parser.

// note though that BigNumbers are only supported in arithmetic functions

console.log('use BigNumbers in the expression parser')

print(math.eval('0.1 + 0.2')) // BigNumber, 0.3

print(math.eval('0.3 / 0.2')) // BigNumber, 1.5

console.log()

/**

* Helper function to output a value in the console. Value will be formatted.

* @param {*} value

function print (value) {

console.log(math.format(value))

}

mathjs/examples/bignumbers.js at develop · Dionuta/mathjs · GitHub

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