[Kst] ASCII data - confusion about multiple plots

[Ben Lewis]

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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