Miscalculations with dataframes longer than ~45 row

[fcorallini]

Problem description

On some Dell Vostro 220 machines we found errors in the calculation in the following methods: .mul() .div() .add() .sub() When Dataframe are longer than 42 row we got calculations errors. We are using Danfo Javascript library in browser via CDN, the error occurs in both updated Chromium and Firefox. The error occurs only when dataframes have more than 42 rows.

Example Code

 var dati = [
        [1.5, 2.8, 3.2],
        [4.7, 5.1, 6.9],
        [7.3, 8.6, 9.4],
        [10.2, 11.9, 12.5],
        [13.7, 14.3, 15.8],
        [16.6, 17.9, 18.1],
        [19.4, 20.7, 21.3],
        [22.9, 23.5, 24.8],
        [25.6, 26.3, 27.7],
        [28.1, 29.9, 30.4],
        [31.8, 32.2, 33.6],
        [34.9, 35.2, 36.7],
        [37.4, 38.6, 39.9],
        [40.1, 41.5, 42.8],
        [43.9, 44.7, 45.2],
        [46.8, 47.3, 48.1],
        [49.4, 50.6, 51.9],
        [52.7, 53.1, 54.5],
        [55.2, 56.9, 57.3],
        [58.4, 59.7, 60.2],
        [61.3, 62.5, 63.9],
        [64.7, 65.2, 66.6],
        [67.9, 68.3, 69.1],
        [70.6, 71.4, 72.8],
        [73.2, 74.5, 75.9],
        [76.7, 77.1, 78.4],
        [79.3, 80.8, 81.6],
        [82.5, 83.7, 84.2],
        [85.1, 86.4, 87.9],
        [88.6, 89.2, 90.7],
        [91.4, 92.8, 93.3],
        [94.1, 95.6, 96.9],
        [97.8, 98.2, 99.5],
        [100.4, 101.7, 102.3],
        [103.6, 104.9, 105.1],
        [106.3, 107.5, 108.7],
        [109.9, 110.4, 111.8],
        [112.7, 113.1, 114.6],
        [115.2, 116.5, 117.3],
        [118.9, 119.3, 120.7],
        [121.5, 122.8, 123.6],
        [124.2, 125.7, 126.9],
        [127.6, 128.1, 129.4],
        [130.3, 131.7, 132.2]
      ]

var df = new dfd.DataFrame(dati)

df.mul(1).print() 

Wrong Results

╔════════════╤═══════════════════╤═══════════════════╤═══════════════════╗
║            │ 0                 │ 1                 │ 2                 ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 0          │ 1.5               │ 2.80078125        │ 3.19921875        ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 1          │ 4.69921875        │ 5.1015625         │ 6.8984375         ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 2          │ 7.30078125        │ 8.6015625         │ 5.1015625         ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 3          │ 6.8984375         │ 7.30078125        │ 8.6015625         ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 4          │ 13.703125         │ 14.296875         │ 15.796875         ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 5          │ 16.59375          │ 17.90625          │ 14.296875         ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 6          │ 15.796875         │ 16.59375          │ 13.703125         ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 7          │ 14.296875         │ 23.5              │ 16.59375          ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 8          │ 25.59375          │ 26.296875         │ 27.703125         ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 9          │ 28.09375          │ 29.90625          │ 30.40625          ║ 
╚════════════╧═══════════════════╧═══════════════════╧═══════════════════╝

Expected Results

╔════════════╤═══════════════════╤═══════════════════╤═══════════════════╗
║            │ 0                 │ 1                 │ 2                 ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 0          │ 1.5               │ 2.7999999523162…  │ 3.2000000476837…  ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 1          │ 4.6999998092651…  │ 5.0999999046325…  │ 6.9000000953674…  ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 2          │ 7.3000001907348…  │ 8.6000003814697…  │ 9.3999996185302…  ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 3          │ 10.199999809265…  │ 11.899999618530…  │ 12.5              ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 4          │ 13.699999809265…  │ 14.300000190734…  │ 15.800000190734…  ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 5          │ 16.600000381469…  │ 17.899999618530…  │ 18.100000381469…  ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 6          │ 19.399999618530…  │ 20.700000762939…  │ 21.299999237060…  ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 7          │ 22.899999618530…  │ 23.5              │ 24.799999237060…  ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 8          │ 25.600000381469…  │ 26.299999237060…  │ 27.700000762939…  ║
╟────────────┼───────────────────┼───────────────────┼───────────────────╢
║ 9          │ 28.100000381469…  │ 29.899999618530…  │ 30.399999618530…  ║
╚════════════╧═══════════════════╧═══════════════════╧═══════════════════╝

Desktop (please complete the following information):

• OS: Ubuntu 18.04
• HW: Dell Vostro 220
• Browser Chromium 93.0.4577.63
• Browser Firefox 107.0 (64-bit)

Additional context

The error occurs with updated [email protected] The error occurs also with the latest browser version, in anonymous browsing without extension. In these machine only works an old version WebGL, I don't know if it could be related to that ...

Screenshots

[radutanasa]

I just tested this in https://jsonconsole.com with your exact code. I used Chrome Version 116.0.5845.96 (Official Build) (arm64) on macOS Ventura 13.4.1. It seems to be working as expected.

[fcorallini]

The bug occurs only when only version 1 of webgl is present. if webgl is present in both versions or absent it does not occur

[gcorazza1]

Any update?