<div dir="ltr">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.<div><br></div><div>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!!</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Feb 3, 2016 at 3:53 PM, Barth Netterfield <span dir="ltr"><<a href="mailto:netterfield@astro.utoronto.ca" target="_blank">netterfield@astro.utoronto.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Only non-redundant lines ever get sent to the graphics card, so that really won't matter.<div>How many points are you plotting?</div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Feb 3, 2016 at 6:50 PM, Daniel Miller <span dir="ltr"><<a href="mailto:dmiller@vitalconnect.com" target="_blank">dmiller@vitalconnect.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">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... <div><br></div><div>Thanks, I'll try that!!</div><div><br></div></div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Feb 3, 2016 at 3:48 PM, Ben Lewis <span dir="ltr"><<a href="mailto:benlewis003@gmail.com" target="_blank">benlewis003@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Hi Dan,<br>
<br>
It sounds like each channel has its own sample rate (or is
asynchronous).<br>
<br>
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.<br>
<br>
For example<br>
<br>
timestamp, data_x, data_y, data_z<br>
0, 10, 10, 10<br>
1, 20, 10, 10<br>
2, 30, 20, 10<br>
3, 40, 20, 10<br>
4, 50, 30, 10<br>
5, 60, 30, 10<br>
6, 70, 40, 10<br>
7, 80, 40, 10<br>
8, 90, 50, 10<br>
9, 100, 50, 20<br>
<br>
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.<br>
<br>
Would this work in your case?<br>
<br>
Regards, Ben<div><div><br>
<br>
<div>On 4/02/2016 10:36 AM, Daniel Miller
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">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.
<div><br>
</div>
<div>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...</div>
<div><br>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Feb 3, 2016 at 3:33 PM, Barth
Netterfield <span dir="ltr"><<a href="mailto:netterfield@astro.utoronto.ca" target="_blank">netterfield@astro.utoronto.ca</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">As you have sort of figured out, kst's data
source model will want you to have 3 different ascii files
in this case.
<div><br>
</div>
<div>But, if you just want to plot points, and not lines,
you can use NaN as your bad data marker.</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">
<div>
<div>On Wed, Feb 3, 2016 at 6:30 PM,
Daniel Miller <span dir="ltr"><<a href="mailto:dmiller@vitalconnect.com" target="_blank"></a><a href="mailto:dmiller@vitalconnect.com" target="_blank">dmiller@vitalconnect.com</a>></span>
wrote:<br>
</div>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div>
<div dir="ltr">I have kst2 working with single
plot stream... that works very nicely. At
this point, I'm using space as separator
between fields.
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>I want kst2 to read this ascii data file
and plot 3 separate graphs on one plot. </div>
<div>I'm a little confused about how to do
this, though; </div>
<div><br>
</div>
<div>for example, say I have a line with data
for data_z; this will look something like:</div>
<div>timestamp data_z </div>
<div>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:</div>
<div>timestamp unused_x unused_y data_z</div>
<div>timestamp unused_x data_y unused_z</div>
<div>etc...</div>
<div><br>
</div>
<div>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:</div>
<div><br>
</div>
<div>timestamp, 0, 0, data_z</div>
<div>timestamp, 0, data_y, 0</div>
<div><br>
</div>
<div>Except that in some cases, 0 is valid
data; I *think* I need some way to represent
"invalid data" in the unused fields.</div>
<div><br>
</div>
<div>Is this understandable?? How do I handle
this??</div>
<div>Dan Miller</div>
</div>
<br>
</div>
</div>
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<div><span style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse;color:rgb(136,136,136)">C.
Barth Netterfield<br>
University of Toronto<br>
<a href="tel:416-845-0946" value="+14168450946" target="_blank">416-845-0946</a></span>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div><span style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse;color:rgb(136,136,136)">C. Barth Netterfield<br>University of Toronto<br><a href="tel:416-845-0946" value="+14168450946" target="_blank">416-845-0946</a></span><div><span style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse;color:rgb(136,136,136)"><br></span></div></div>
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