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c5971b371a
* chore(package): update standard to version 12.0.0
* update to new lint version with --fix
I believe this mainly adds whitespace to `{}`'s.
* Replace assert.equal with assert.strictEqual
This breaks a lot of tests which I will endevour to fix in the next
commits.
* Fix most errors due to assert.strictEquals
Some instances of `strictEquals` are replaced by `deepEquals`.
`toString` has been used to make some string comparisions explicit.
Tests will still fail untill #1236 and #1237 are fixed.
* Fix assertion erros due to -0
With node 10, assert.strictEqual no longer considers `0 === -0`.
I missed these first time round as I was using node 8.
* Put toString correct side of bracket
I was converting the constructor to a string rather
than the result of the computation. Oops.
* Fixed #1236: quantileSeq has inconsistant return
* Update package-lock
* Fixed #1237: norm sometimes returning a complex number instead of number
* Fix cli tests
* More changes for standardjs, and fixes in unit tests
68 lines
2.0 KiB
JavaScript
68 lines
2.0 KiB
JavaScript
// complex numbers
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// load math.js (using node.js)
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const math = require('../index')
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// create a complex number with a numeric real and complex part
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console.log('create and manipulate complex numbers')
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const a = math.complex(2, 3)
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print(a) // 2 + 3i
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// read the real and complex parts of the complex number
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print(a.re) // 2
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print(a.im) // 3
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// clone a complex value
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const clone = a.clone()
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print(clone) // 2 + 3i
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// adjust the complex value
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a.re = 5
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print(a) // 5 + 3i
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// create a complex number by providing a string with real and complex parts
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const b = math.complex('3-7i')
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print(b) // 3 - 7i
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console.log()
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// perform operations with complex numbers
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console.log('perform operations')
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print(math.add(a, b)) // 8 - 4i
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print(math.multiply(a, b)) // 36 - 26i
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print(math.sin(a)) // -9.6541254768548 + 2.8416922956064i
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// some operations will return a complex number depending on the arguments
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print(math.sqrt(4)) // 2
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print(math.sqrt(-4)) // 2i
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console.log()
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// create a complex number from polar coordinates
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console.log('create complex numbers with polar coordinates')
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const c = math.complex({ r: math.sqrt(2), phi: math.pi / 4 })
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print(c) // 1 + i
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// get polar coordinates of a complex number
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const d = math.complex(3, 4)
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console.log(d.abs(), d.arg()) // radius = 5, phi = 0.9272952180016122
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console.log()
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// comparision operations
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// note that there is no mathematical ordering defined for complex numbers
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// we can only check equality. To sort a list with complex numbers,
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// the natural sorting can be used
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console.log('\ncomparision and sorting operations')
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console.log('equal', math.equal(a, b)) // returns false
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const values = [a, b, c]
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console.log('values:', math.format(values, 14)) // [5 + 3i, 3 - 7i, 1 + i]
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math.sort(values, 'natural')
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console.log('sorted:', math.format(values, 14)) // [1 + i, 3 - 7i, 5 + 3i]
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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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