[Kst] ASCII data - confusion about multiple plots

Wed Feb 3 23:58:38 UTC 2016

should be fine.

I look at over 100 million from time to time.

On Wed, Feb 3, 2016 at 6:57 PM, Daniel Miller <dmiller at vitalconnect.com>
wrote:

> Number of data points varies tremendously, depending on how long we were
> collecting data, and what sample rate was... accelerometer data is sampled
> at 4 hz, which is 12 points per second; if run over a weekend (a common
> sampling period) that would be about 3 million points.
>
> I suspect that kst2 won't have trouble with this; I've already been using
> it to plot 30,000 points, which it handles almost instantly!!
>
>
> On Wed, Feb 3, 2016 at 3:53 PM, Barth Netterfield <
> netterfield at astro.utoronto.ca> wrote:
>
>> Only non-redundant lines ever get sent to the graphics card, so that
>> really won't matter.
>> How many points are you plotting?
>>
>> On Wed, Feb 3, 2016 at 6:50 PM, Daniel Miller <dmiller at vitalconnect.com>
>> wrote:
>>
>>> huh... yeah, that might well work!!  It'll be plotting three times as
>>> much data as it really is receiving, but what the heck, we have Nvidia
>>> graphics cards...
>>>
>>> Thanks, I'll try that!!
>>>
>>>
>>> On Wed, Feb 3, 2016 at 3:48 PM, Ben Lewis <benlewis003 at gmail.com> wrote:
>>>
>>>> Hi Dan,
>>>>
>>>> It sounds like each channel has its own sample rate (or is
>>>> asynchronous).
>>>>
>>>> In cases like this I use the channel with the highest sample rate for
>>>> the time stamp. Then for all other channels I use the old value until it is
>>>> updated.
>>>>
>>>> For example
>>>>
>>>> timestamp, data_x, data_y, data_z
>>>> 0, 10, 10, 10
>>>> 1, 20, 10, 10
>>>> 2, 30, 20, 10
>>>> 3, 40, 20, 10
>>>> 4, 50, 30, 10
>>>> 5, 60, 30, 10
>>>> 6, 70, 40, 10
>>>> 7, 80, 40, 10
>>>> 8, 90, 50, 10
>>>> 9, 100, 50, 20
>>>>
>>>> In this case data_x updates at the fast rate, data_y updates at half of
>>>> data_x and data_y updates at 1/10 of data_x.
>>>>
>>>> Would this work in your case?
>>>>
>>>> Regards, Ben
>>>>
>>>>
>>>> On 4/02/2016 10:36 AM, Daniel Miller wrote:
>>>>
>>>> hmmm... well, I prefer lines to points in kst2; the plots with points
>>>> are sort of hard to utilize, but I'll take a look at it and see what it
>>>> looks like.
>>>>
>>>> Alternately, is there some way to input three data files, but have them
>>>> plotted on one plot??  I haven't really seen that in the manual either...
>>>>
>>>>
>>>> On Wed, Feb 3, 2016 at 3:33 PM, Barth Netterfield <
>>>> netterfield at astro.utoronto.ca> wrote:
>>>>
>>>>> As you have sort of figured out, kst's data source model will want you
>>>>> to have 3 different ascii files in this case.
>>>>>
>>>>> But, if you just want to plot points, and not lines, you can use NaN
>>>>> as your bad data marker.
>>>>>
>>>>> On Wed, Feb 3, 2016 at 6:30 PM, Daniel Miller <
>>>>> <dmiller at vitalconnect.com>dmiller at vitalconnect.com> wrote:
>>>>>
>>>>>> I have kst2 working with single plot stream... that works very
>>>>>> nicely.  At this point, I'm using space as separator between fields.
>>>>>>
>>>>>> However, we have a couple of data streams which contain multiple data
>>>>>> (x, y, z); in this situation, what our data would look like is ( timestamp,
>>>>>> data), but the data would be one of { data_x, data_y, data_z }.  In other
>>>>>> words, the data stream that I receive from the hardware, delivers data_x,
>>>>>> data_y, data_z in separate messages, with different timestamps.
>>>>>>
>>>>>> I want kst2 to read this ascii data file and plot 3 separate graphs
>>>>>> on one plot.
>>>>>> I'm a little confused about how to do this, though;
>>>>>>
>>>>>> for example, say I have a line with data for data_z; this will look
>>>>>> something like:
>>>>>> timestamp data_z
>>>>>> however, I want one file to contain data for all three streams, so
>>>>>> I'm guessing I need to have empty fields for the not-relevant data; maybe
>>>>>> something like:
>>>>>> timestamp unused_x unused_y data_z
>>>>>> timestamp unused_x data_y unused_z
>>>>>> etc...
>>>>>>
>>>>>> So first off, I probably have to use a different separator rather
>>>>>> than space for separator; but even with comma, I still have a problem; for
>>>>>> example:
>>>>>>
>>>>>> timestamp, 0, 0, data_z
>>>>>> timestamp, 0, data_y, 0
>>>>>>
>>>>>> Except that in some cases, 0 is valid data; I *think* I need some way
>>>>>> to represent "invalid data" in the unused fields.
>>>>>>
>>>>>> Is this understandable??  How do I handle this??
>>>>>> Dan Miller
>>>>>>
>>>>>> _______________________________________________
>>>>>> Kst mailing list
>>>>>> Kst at kde.org
>>>>>> https://mail.kde.org/mailman/listinfo/kst
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> C. Barth Netterfield
>>>>> University of Toronto
>>>>> 416-845-0946
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Kst mailing list
>>>>> Kst at kde.org
>>>>> https://mail.kde.org/mailman/listinfo/kst
>>>>>
>>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Kst mailing listKst at kde.orghttps://mail.kde.org/mailman/listinfo/kst
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Kst mailing list
>>>> Kst at kde.org
>>>> https://mail.kde.org/mailman/listinfo/kst
>>>>
>>>>
>>>
>>> _______________________________________________
>>> Kst mailing list
>>> Kst at kde.org
>>> https://mail.kde.org/mailman/listinfo/kst
>>>
>>>
>>
>>
>> --
>> C. Barth Netterfield
>> University of Toronto
>> 416-845-0946
>>
>>
>> _______________________________________________
>> Kst mailing list
>> Kst at kde.org
>> https://mail.kde.org/mailman/listinfo/kst
>>
>>
>
> _______________________________________________
> Kst mailing list
> Kst at kde.org
> https://mail.kde.org/mailman/listinfo/kst
>
>

-- 
C. Barth Netterfield
University of Toronto
416-845-0946
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.kde.org/pipermail/kst/attachments/20160203/0c655684/attachment.html>