Re: CSS X-Y Graph

[John Dobbins <john.dobbins@cornell.edu>]

Xihui.

Thanks. I'll look forward to trying the new version.

John

On 2/22/2012 9:53 AM, Chen, Xihui wrote:
> Hi John and Michael,
>
> Using the rule as Michael described should be the best way to do that, but I think it is not a reasonable to cut the start of the waveform, so I just changed it to cut the end in my code. So in next version of BOY, you should be able to use rule to do this.
>
> For now, there is an alternative way to do that: you can manipulate the data array in script before plotting it. For example, you can only plot an arbitrary subarray of the waveform or only plot the even/odd points. Please see BOY Examples->Miscellaneous->ArraysOperation->PlotFirstNPointsExample.opi
>
> Thanks,
> Xihui
>
>
>
>
> > -----Original Message-----
> > From: Michael Davidsaver [mailto:mdavidsaver@bnl.gov]
> > Sent: Tuesday, February 21, 2012 6:48 PM
> > To: tech-talk@aps.anl.gov
> > Subject: Re: CSS X-Y Graph
> >
> > Hello John,
> >
> > I too have had trouble doing this.  I was able to setup a rule to set
> > the buffer size from the NORD field of a waveform record.  The result
> > was that, when the size was reduced, the start of the waveform was
> > removed instead of the end.  So not very useful.
> >
> > In the end, as this data was for display only, I "fixed" this by
> > padding
> > the arrays by repeating the last value.  This at least produces the
> > correct visual effect.
> >
> > I would welcome a better solution.
> >
> > Michael
> >
> >
> > On 2/21/2012 4:45 PM, John Dobbins wrote:
> > > All,
> > >
> > > I am trying to create an X-Y graph for displaying a waveform which
> > may change in length.
> > > A Tech-Talk thread from June 2010
> > >
> > > http://www.aps.anl.gov/epics/tech-talk/2010/msg00740.php
> > >
> > > suggests to put a PV into "Buffer Size" . However I am trying to do
> > that now (CSS 3.1) and find I can only put an integer into this field,
> > not a PV.
> > > Taking a step back, is there a recommended approach for displaying a
> > waveform which may vary in size. I would like the plot x scale to
> > automatically adjust to the new waveform length.
> > > Thanks,
> > >
> > > John Dobbins
> > >
> > > Cornell University