[Kst] ASCII data - confusion about multiple plots

Wed Feb 3 23:55:53 UTC 2016

I wouldn't be concerned about plotting too much data. Kst just eats it up. I regularly plot multiple 
channels with x1000 over sampling at high sample rates and I never have a problem.

On 4/02/2016 10:53 AM, Barth Netterfield 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 
> <mailto: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
>     <mailto: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
>>         <mailto: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
>>             <mailto: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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>>
>>
>>
>>             -- 
>>             C. Barth Netterfield
>>             University of Toronto
>>             416-845-0946 <tel:416-845-0946>
>>
>>
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>>
>>
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> -- 
> C. Barth Netterfield
> University of Toronto
> 416-845-0946
>
>
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