[Kst] Re: Addition of sample on a specific range

mathieu660r at gmail.com mathieu660r at gmail.com
Thu Mar 10 17:29:08 CET 2011


I would want to thanks everyone who tried to solve my problem. The method  
proposed by mister Netterfield is exactly what I was searching for. I will  
set a delay on my hardware so the sample will be every second, this way I  
will be able to use you method. Because I don't have acces to the hardware  
for the moment I can't test you solution. But, I just want to be sure of  
something. If I input the start and end of the sample will this vector will  
update itself and sample it for each hour ? I know you talked about that in  
your email but will this iterate automatically ? I also wanna know if it's  
possible for KST to parse data on a COM port and flush the value every day?


On Mar 9, 2011 7:09pm, Barth Netterfield <netterfield at astro.utoronto.ca>  
> Are the data evenly sampled?

> If so: (this is for kst2. kst1.x is similar).

> When you read in the data (eg, data wizard page 3, or in the vector

> dialog), you will see in the "Data Range" widget an option

> "[ ] Read 1 sample per ________ frames [ ] Boxcar filter first"

> If you select both of these, and set the number of frames to the

> number of samples in an hour, then the data vector you read will be

> sampled once per hour, and will contain the average over that period.

> eg, if you sample the data once per second:

> [ x ] Read 1 sample per _3600_ frames [ x ] Boxcar filter first

> The resulting vector will contain the average for each hour, sampled

> once per hour.

> Then use an equation to multiply by the cost per kWhr to give the cost  
> per hour.

> If you want the integrated cost, you can use the Cumulative Sum filter

> (in the plot->rmb->Filter->[Curvename] pulls up the filter dialog.

> Then select "Cumulative sum". Set the value of your dX, and perhaps

> chose to place the curve in a new plot).

> If the data are not evenly sampled, it is going to be hard to deal with  
> in kst.

> cbn

> On Mon, Mar 7, 2011 at 10:49 PM, mathieu660r at gmail.com> wrote:

> > Hi,

> >

> > I'm new here and I find KST a really great tool for fast and efficient

> > plotting. I'm currently using some hardware to measure the real power of

> > some lights. I can plot the power easily and I can get the power value  
> on

> > the y axis and the time on the x axis. My question is a little bit  
> complex

> > so I will try to explain the best as I can if you have questions please  
> ask.

> > So I want to add all the value of a time sample ( example : all the  
> value

> > during 60 minutes and do it for each 60 minutes) and multiply the total

> > value by another value to get an approximation of the cost of  
> electricity.

> >

> > Thanks,

> > Mathieu R.

> > _______________________________________________

> > Kst mailing list

> > Kst at kde.org

> > https://mail.kde.org/mailman/listinfo/kst

> >

> >

> --

> C. Barth Netterfield

> University of Toronto

> 416-845-0946

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