[Kst] ASCII data - confusion about multiple plots

[Barth Netterfield]

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
>>>>
>>>> _______________________________________________
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>>>> Kst at kde.org
>>>> https://mail.kde.org/mailman/listinfo/kst
>>>>
>>>>
>>>
>>>
>>> --
>>> C. Barth Netterfield
>>> University of Toronto
>>> 416-845-0946
>>>
>>>
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>>>
>>
>>
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-- 
C. Barth Netterfield
University of Toronto
416-845-0946
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