Members
WFft
FFT與iFFT
Example
let arr
let res
arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
res = wf.fft1d(arr)
console.log(res)
// => [
// [ 120, 0 ],
// [ -8, 40.21871593700678 ],
// [ -8, 19.31370849898476 ],
// [ -7.999999999999999, 11.972846101323913 ],
// [ -8, 8 ],
// [ -8, 5.345429103354391 ],
// [ -8, 3.313708498984761 ],
// [ -7.999999999999999, 1.5912989390372623 ],
// [ -8, 0 ],
// [ -7.999999999999999, -1.5912989390372623 ],
// [ -8, -3.313708498984761 ],
// [ -8, -5.345429103354391 ],
// [ -8, -8 ],
// [ -7.999999999999999, -11.972846101323913 ],
// [ -8, -19.31370849898476 ],
// [ -8, -40.21871593700678 ]
// ]
arr = [
[120, 0],
[-8, 40.21871593700678],
[-8, 19.31370849898476],
[-7.999999999999999, 11.972846101323913],
[-8, 8],
[-8, 5.345429103354391],
[-8, 3.313708498984761],
[-7.999999999999999, 1.5912989390372623],
[-8, 0],
[-7.999999999999999, -1.5912989390372623],
[-8, -3.313708498984761],
[-8, -5.345429103354391],
[-8, -8],
[-7.999999999999999, -11.972846101323913],
[-8, -19.31370849898476],
[-8, -40.21871593700678]
]
res = wf.ifft1d(arr)
console.log(res)
// => [
// 0, 1,
// 2, 3.0000000000000018,
// 4, 5.000000000000002,
// 6, 7,
// 8, 9,
// 10, 10.999999999999998,
// 12, 12.999999999999998,
// 14, 15
// ]Methods
fft1d(arr) → {Array}
Example
let arr
let res
arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
res = wf.fft1d(arr)
console.log(res)
// => [
// [ 120, 0 ],
// [ -8, 40.21871593700678 ],
// [ -8, 19.31370849898476 ],
// [ -7.999999999999999, 11.972846101323913 ],
// [ -8, 8 ],
// [ -8, 5.345429103354391 ],
// [ -8, 3.313708498984761 ],
// [ -7.999999999999999, 1.5912989390372623 ],
// [ -8, 0 ],
// [ -7.999999999999999, -1.5912989390372623 ],
// [ -8, -3.313708498984761 ],
// [ -8, -5.345429103354391 ],
// [ -8, -8 ],
// [ -7.999999999999999, -11.972846101323913 ],
// [ -8, -19.31370849898476 ],
// [ -8, -40.21871593700678 ]
// ]Parameters:
| Name | Type | Description |
|---|---|---|
arr |
Array | 輸入數據陣列 |
Returns:
回傳轉換後數據陣列
- Type
- Array
filter1d(arr, dt, hzStart, hzEnd) → {Array}
Example
let dt
let arr
let res
//dt=0.0078125s, 3+6hz
dt = 0.0078125
arr = [
0,
0.437015151709824,
0.845854910274064,
1.20056554679302,
1.47944976553089,
1.66674368151922,
1.75379573376597,
1.73964987434863,
1.63098631369783,
1.44142799002054,
1.19027504868833,
0.900778315875612,
0.598101848038141,
0.307150781019375,
0.0504516520458098,
-0.153732804251563,
-0.292893218813452,
-0.361241031239776,
-0.360072875476548,
-0.297503430771426,
-0.187593110348962,
-0.0489494660021425,
0.0970731816865672,
0.228416556922734,
0.324423348821458,
0.367818520155133,
0.346391996239585,
0.254233601317238,
0.0924099202087415,
-0.130978839760706,
-0.401370102712605,
-0.698891832710318,
-1,
-1.27946118721924,
-1.51251056875181,
-1.67699974648618,
-1.75534914481383,
-1.73613585202716,
-1.61517856456688,
-1.39602400854158,
-1.08979021355164,
-0.714376916729265,
-0.293107462345689,
0.147084814656977,
0.577773754381215,
0.971283137555866,
1.30286634912854,
1.55263964022464,
1.70710678118655,
1.76014786721285,
1.7133908766509,
1.57593734934667,
1.36346871276832,
1.09681259653473,
0.80009440465607,
0.498634516368545,
0.216772751324739,
-0.0241926543480825,
-0.207774827040493,
-0.323625771825179,
-0.368309299491684,
-0.345455359932455,
-0.265285555765141,
-0.1435542027991,
-3.67544536472586E-16,
0.1435542027991,
0.26528555576514,
0.345455359932455,
0.368309299491684,
0.323625771825179,
0.207774827040493,
0.0241926543480835,
-0.216772751324738,
-0.498634516368544,
-0.800094404656069,
-1.09681259653473,
-1.36346871276832,
-1.57593734934667,
-1.7133908766509,
-1.76014786721285,
-1.70710678118655,
-1.55263964022464,
-1.30286634912855,
-0.971283137555864,
-0.577773754381218,
-0.14708481465698,
0.293107462345686,
0.714376916729258,
1.08979021355163,
1.39602400854158,
1.61517856456688,
1.73613585202716,
1.75534914481383,
1.67699974648618,
1.51251056875181,
1.27946118721924,
1,
0.698891832710321,
0.40137010271261,
0.130978839760704,
-0.0924099202087405,
-0.254233601317238,
-0.346391996239584,
-0.367818520155133,
-0.324423348821457,
-0.228416556922734,
-0.0970731816865679,
0.0489494660021418,
0.18759311034896,
0.297503430771423,
0.360072875476548,
0.361241031239776,
0.292893218813452,
0.153732804251566,
-0.0504516520458086,
-0.307150781019376,
-0.598101848038137,
-0.900778315875611,
-1.19027504868833,
-1.44142799002054,
-1.63098631369783,
-1.73964987434863,
-1.75379573376597,
-1.66674368151922,
-1.47944976553089,
-1.20056554679302,
-0.845854910274064,
-0.43701515170983,
]
res = wf.filter1d(arr, dt, 0, 2)
fs.writeFileSync('./filter1d_128p_0_2Hz.txt', _.join(_.map(res, w.cstr), '\n'), 'utf8')
console.log(res)
// => [
// 1.900130354665816e-17, 3.171289289530446e-17, 4.332415707367346e-17,
// 5.3695846472494235e-17, 6.269785986213638e-17, 7.021057013202281e-17,
// 7.612605570310054e-17, 8.034922556306299e-17, 8.279882688317987e-17,
// 8.340832529158958e-17, 8.212664909001537e-17, 7.891878999746445e-17,
// 7.376625437307838e-17, 6.666736029780011e-17, 5.76373773671691e-17,
// 4.670850755121418e-17, 3.392970699761463e-17, 1.936635017644406e-17,
// 3.099739274245762e-18, -1.4773536772583848e-17, -3.414238777438079e-17,
// -5.488214509861833e-17, -7.685561326121688e-17, -9.991424053039947e-17,
// -1.2389939763250017e-16, -1.486437526110982e-16, -1.7397272896700838e-16,
// -1.9970603340589478e-16, -2.256592388503064e-16, -2.516454078402015e-16,
// -2.77476741055675e-16, -3.0296623545138124e-16, -3.2792933639642097e-16,
// -3.5218556826715847e-16, -3.7556012814304826e-16, -3.978854276051409e-16,
// -4.1900256813015115e-16, -4.387627362050729e-16, -4.570285050522503e-16,
// -4.736750307452075e-16, -4.885911315028551e-16, -5.016802400642502e-16,
// -5.128612202571727e-16, -5.220690401697757e-16, -5.292552957029921e-16,
// -5.343885797091161e-16, -5.374546933952765e-16, -5.384566981752595e-16,
// -5.374148076748214e-16, -5.34366121119686e-16, -5.293642008471598e-16,
// -5.224784981672418e-16, -5.137936332429572e-16, -5.034085360485657e-16,
// -4.914354567849328e-16, -4.779988553710472e-16, -4.632341807774995e-16,
// -4.472865520107286e-16, -4.303093534859731e-16, -4.124627583332443e-16,
// -3.939121938565287e-16, -3.7482676390538224e-16, -3.5537764331493207e-16,
// -3.357364598212945e-16, -3.1607367896215424e-16, -2.965570074258067e-16,
// -2.773498301168155e-16, -2.586096958645067e-16, -2.4048686621515183e-16,
// -2.231229411245869e-16, -2.066495746112324e-16, -1.9118729254734605e-16,
// -1.7684442376738718e-16, -1.6371615456625556e-16, -1.5188371545758223e-16,
// -1.4141370777480338e-16, -1.323575763378787e-16, -1.2475123298934835e-16,
// -1.1861483433865337e-16, -1.1395271555741253e-16, -1.1075348055508646e-16,
// -1.0899024734876648e-16, -1.0862104593732587e-16, -1.0958936451335684e-16,
// -1.1182483841044193e-16, -1.1524407480220627e-16, -1.197516048565951e-16,
// -1.2524095381656962e-16, -1.3159581833879772e-16, -1.3869133938591487e-16,
// -1.4639545804553208e-16, -1.5457034084925898e-16, -1.6307386049529978e-16,
// -1.7176111734511303e-16, -1.8048598667334478e-16, -1.8910267640450308e-16,
// -1.974672799720086e-16, -2.054393089862649e-16, -2.1288319059773535e-16,
// -2.1966971478677226e-16,
// ... 28 more items
// ]
res = wf.filter1d(arr, dt, 0, 4)
fs.writeFileSync('./filter1d_128p_0_4Hz.txt', _.join(_.map(res, w.cstr), '\n'), 'utf8')
console.log(res)
// => [
// -4.827486540753305e-16, 0.1467304744553614, 0.29028467725446216,
// 0.42755509343028203, 0.5555702330196024, 0.6715589548470189,
// 0.7730104533627374, 0.8577286100002727, 0.9238795325112873,
// 0.970031253194545, 0.9951847266721979, 0.9987954562051734,
// 0.9807852804032313, 0.9415440651830219, 0.8819212643483562,
// 0.803207531480646, 0.7071067811865485, 0.5956993044924345,
// 0.4713967368259986, 0.33688985339222094, 0.19509032201612894,
// 0.049067674327418584, -0.09801714032956012, -0.24298017990326354,
// -0.38268343236508945, -0.5141027441932216, -0.6343932841636454,
// -0.7409511253549594, -0.8314696123025456, -0.9039892931234439,
// -0.9569403357322095, -0.9891765099647818, -1.0000000000000007,
// -0.989176509964782, -0.9569403357322102, -0.9039892931234446,
// -0.8314696123025467, -0.7409511253549607, -0.6343932841636468,
// -0.5141027441932232, -0.38268343236509117, -0.2429801799032654,
// -0.09801714032956207, 0.04906767432741662, 0.195090322016127,
// 0.33688985339221894, 0.47139673682599664, 0.5956993044924324,
// 0.7071067811865467, 0.8032075314806444, 0.8819212643483545,
// 0.9415440651830205, 0.9807852804032301, 0.9987954562051723,
// 0.9951847266721967, 0.9700312531945441, 0.9238795325112867,
// 0.8577286100002725, 0.7730104533627374, 0.6715589548470189,
// 0.5555702330196027, 0.4275550934302826, 0.2902846772544628,
// 0.14673047445536228, 4.752026505856477e-16, -0.14673047445536128,
// -0.29028467725446194, -0.4275550934302818, -0.5555702330196022,
// -0.6715589548470184, -0.773010453362737, -0.8577286100002722,
// -0.9238795325112868, -0.9700312531945445, -0.9951847266721975,
// -0.9987954562051732, -0.9807852804032311, -0.9415440651830217,
// -0.8819212643483559, -0.8032075314806458, -0.7071067811865485,
// -0.5956993044924345, -0.4713967368259986, -0.33688985339222105,
// -0.19509032201612905, -0.04906767432741875, 0.09801714032955992,
// 0.24298017990326332, 0.3826834323650892, 0.5141027441932213,
// 0.6343932841636452, 0.740951125354959, 0.8314696123025451,
// 0.9039892931234434, 0.956940335732209, 0.9891765099647813,
// 1.0000000000000002, 0.9891765099647816, 0.9569403357322097,
// 0.9039892931234439,
// ... 28 more items
// ]
res = wf.filter1d(arr, dt, 4, 8)
fs.writeFileSync('./filter1d_128p_4_8Hz.txt', _.join(_.map(res, w.cstr), '\n'), 'utf8')
console.log(res)
// => [
// -5.79305934263002e-16, 0.2902846772544621, 0.5555702330196025,
// 0.7730104533627378, 0.9238795325112876, 0.9951847266721983,
// 0.980785280403232, 0.8819212643483566, 0.7071067811865489,
// 0.471396736825999, 0.19509032201612922, -0.09801714032956009,
// -0.3826834323650895, -0.6343932841636457, -0.8314696123025459,
// -0.9569403357322098, -1.000000000000001, -0.9569403357322103,
// -0.8314696123025468, -0.6343932841636469, -0.382683432365091,
// -0.09801714032956177, 0.19509032201612747, 0.47139673682599736,
// 0.7071067811865476, 0.8819212643483555, 0.9807852804032312,
// 0.9951847266721979, 0.9238795325112878, 0.7730104533627384,
// 0.5555702330196037, 0.2902846772544636, 1.11697531048158e-15,
// -0.29028467725446144, -0.5555702330196017, -0.773010453362737,
// -0.9238795325112868, -0.9951847266721975, -0.9807852804032314,
// -0.8819212643483562, -0.7071067811865488, -0.4713967368259991,
// -0.19509032201612952, 0.0980171403295596, 0.3826834323650889,
// 0.634393284163645, 0.8314696123025451, 0.9569403357322093,
// 1.0000000000000004, 0.9569403357322098, 0.8314696123025465,
// 0.6343932841636467, 0.38268343236509095, 0.0980171403295618,
// -0.19509032201612736, -0.47139673682599714, -0.7071067811865472,
// -0.8819212643483553, -0.980785280403231, -0.9951847266721975,
// -0.9238795325112876, -0.773010453362738, -0.5555702330196034,
// -0.29028467725446333, -8.663552482114443e-16, 0.29028467725446166,
// 0.5555702330196018, 0.7730104533627369, 0.9238795325112867,
// 0.9951847266721974, 0.9807852804032311, 0.8819212643483559,
// 0.7071067811865485, 0.47139673682599875, 0.19509032201612922,
// -0.09801714032955984, -0.38268343236508906, -0.634393284163645,
// -0.831469612302545, -0.9569403357322089, -1.0000000000000002,
// -0.9569403357322096, -0.8314696123025461, -0.6343932841636465,
// -0.3826834323650908, -0.09801714032956171, 0.1950903220161273,
// 0.47139673682599703, 0.7071067811865471, 0.8819212643483548,
// 0.9807852804032305, 0.9951847266721973, 0.9238795325112874,
// 0.773010453362738, 0.5555702330196033, 0.2902846772544634,
// 9.714153559505677e-16, -0.29028467725446144, -0.5555702330196017,
// -0.7730104533627368,
// ... 28 more items
// ]Parameters:
| Name | Type | Description |
|---|---|---|
arr |
Array | 輸入數據陣列 |
dt |
Number | 輸入數據點時間間隔數字，單位s |
hzStart |
Number | 輸入過濾用帶通頻率下限數字，單位Hz |
hzEnd |
Number | 輸入過濾用帶通頻率上限數字，單位Hz |
Returns:
回傳帶通處理後數據陣列
- Type
- Array
ifft1d(arr) → {Array}
Example
let arr
let res
arr = [
[120, 0],
[-8, 40.21871593700678],
[-8, 19.31370849898476],
[-7.999999999999999, 11.972846101323913],
[-8, 8],
[-8, 5.345429103354391],
[-8, 3.313708498984761],
[-7.999999999999999, 1.5912989390372623],
[-8, 0],
[-7.999999999999999, -1.5912989390372623],
[-8, -3.313708498984761],
[-8, -5.345429103354391],
[-8, -8],
[-7.999999999999999, -11.972846101323913],
[-8, -19.31370849898476],
[-8, -40.21871593700678]
]
res = wf.ifft1d(arr)
console.log(res)
// => [
// 0, 1,
// 2, 3.0000000000000018,
// 4, 5.000000000000002,
// 6, 7,
// 8, 9,
// 10, 10.999999999999998,
// 12, 12.999999999999998,
// 14, 15
// ]Parameters:
| Name | Type | Description |
|---|---|---|
arr |
Array | 輸入數據陣列 |
Returns:
回傳轉換後數據陣列
- Type
- Array