Samples out of order

[andrewheusser]

When streaming from the board, I noticed that some of the samples are coming in out of order. here is a plot of a couple seconds of data. You can see that there is a systematic pattern to which samples are being presented out of order, and the out of order sample number looks to be increasing linearly.

and here's some example data. If you look after 62, 24 is presented a second time. could be a duplicate, or a sample from another block of data

array([[ 0],
       [19],
       [20],
       [21],
       [22],
       [23],
       [ 1],
       [ 2],
       [ 3],
       [ 4],
       [ 5],
       [ 6],
       [ 7],
       [ 8],
       [ 9],
       [10],
       [11],
       [12],
       [13],
       [14],
       [15],
       [16],
       [17],
       [18],
       [19],
       [20],
       [21],
       [22],
       [23],
       [24],
       [25],
       [26],
       [27],
       [28],
       [29],
       [30],
       [31],
       [32],
       [33],
       [34],
       [35],
       [36],
       [37],
       [38],
       [39],
       [40],
       [41],
       [42],
       [43],
       [44],
       [45],
       [46],
       [47],
       [48],
       [49],
       [50],
       [51],
       [52],
       [53],
       [54],
       [55],
       [56],
       [57],
       [58],
       [59],
       [60],
       [61],
       [62],
       [24],
       [63],
       [64],
       [65],
       [66],
       [67],
       [68],
       [69],
       [70],
       [71],
       [72],
       [73],
       [74],
       [75],
       [76],
       [77],
       [78],
       [79],
       [80],
       [81],
       [82],
       [83],
       [84],
       [85],
       [86],
       [87],
       [88],
       [89],
       [90],
       [91],
       [92],
       [93]])

[andrewheusser]

What seems to be happening is that the first 0-255 samples are being stuck into the data stream at later times, in order, which is why this plot looks like it has a linearly increasing function over many blocks of data. I'm going to start up and collect data a few more times to see if this is a consistent pattern, or just some weird artifact that we don't have to worry about

[andrewjaykeller]

Hmm. That is weird. Let me know what you find!

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On Jan 4, 2016, at 9:06 AM, Andy Heusser notifications@github.com wrote:

What seems to be happening is that the first 0-255 samples are being stuck into the data stream at later times, in order, which is why this plot looks like it has a linearly increasing function over many blocks of data. I'm going to start up and collect data a few more times to see if this is a consistent pattern, or just some weird artifact that we don't have to worry about

— Reply to this email directly or view it on GitHub https://github.com/OpenBCI/openbci-js-sdk/issues/15#issuecomment-168685456.

[andrewjaykeller]

Unable to duplicate, placed private property on each sample, see some sample output in the attached txt file. myOutput.txt

[andrewheusser]

I'm closing this because I can't replicate it. Must've been some weirdness with starting and stopping the system a bunch. We should be mindful of this though...it would be good to somehow build in a 'harder' reboot option so that there's no funny business upon restarting the device