Experimental Physics and
Industrial Control System

"Kasemir, Kay" <[email protected]> · Mon, 13 Oct 2014 20:19:19 +0000

If you continue to see the 'index' on the X axis instead of the PV meant to provide the X axis values, you need to check the configuration of the XYGraph.

The "Trace" needs both an "X PV" and a "Y PV". The "Buffer Size" needs to match the size of those two. "Concatenate Data" = "No". "Plot Mode"="Plot last n pts."

-Kay

On Oct 13, 2014, at 3:36 PM, "[email protected]" <[email protected]>
 wrote:

> 
> Hi,
> I just tried to define a const://array in CSS in order to plot X axis with
> a different PV but the problem is always the same, the histogram 'store'
> values correctly but when you plot it X axis refers to 'index' of array;
> 
> just to be more clear imagine that you want to plot a temperature
> histogram where lower bound is -30 and upper bound is +30 with 61 bins
> (one for each temperature value);
> 
> if you store temperature value '-30' it will stored in histo[0]
> if you store temperature value '0' it will stored in histo[30]
> if you store temperature value '+30' it will stored in histo[60]
> 
> well, if you plot this histogram in CSS with XYgraph widget you will
> see X axis starting from 0 to 60 with three little bars located at start
> in the middle and at end of graph; the problem is that X axis value is
> the 'index' and not the 'value' of the temperature. I'm looking for a
> method to display 'value' with a X-axis between -30...+30;
> 
> Thanks in advance,
> Gennaro
> 
> On Mon, 13 Oct 2014, Kasemir, Kay wrote:
> 
>> Hi:
>> 
>> Just as you produce the data for the "Y" axis on the IOC in a histogram record, you might want to generate the data for the "X" axis in a record on the IOC as well.
>> Then configure the XY Graph widget to show those X and Y records.
>> 
>> To generate arbitrary "X" waveforms on the IOC, you may be able to use a "compress" record fed by a calc that counts from your desired start to end value, but otherwise I've used a genSub/aSub record for that.
>> 
>> Thanks,
>> Kay
>> 
>> 
>> On Oct 13, 2014, at 9:48 AM, "[email protected]" <[email protected]>
>> wrote:
>>> Hi,
>>> I'm using a 'histogram' record to store some values:
>>> 
>>> record(histogram,"$(P):noisefloor") {
>>>  field(DTYP,"$(D)")
>>>  field(DESC,"LTC2499 noise floor")
>>>  field(SCAN,"1 second")
>>>  field(SVL,"$(P):microvolt:CH0")
>>>  field(ULIM,20)
>>>  field(LLIM,-20)
>>>  field(NELM,100)
>>> }
>>> 
>>> as you can see number of bin is 100 and values are from -20 to 20;
>>> 
>>> I'm able to create a histogram on CSS starting from XY Graph widget, but
>>> X axis reports values from 0 to 100. Is there a script in order to display
>>> values from -20 to 20 ?
>>> 
>>> If I set 'Minumum' and 'Maximum' properties of "Primary X Axis" to -20 and
>>> 20 the graph is empty because values are plotted by histogram index and not by histogram value... (e.g. value 0 -> position 50)
>>> 
>>> Thanks in advance,
>>> Gennaro
>>> 
>>> --
>>> Gennaro Tortone
>>> INFN Napoli
>>> Italy
>>> tel: +39 81 676169
>>> 
>>> "Computer Science is no more about computers
>>>   than astronomy is about telescopes."
>>>   - Edsger Dijkstra
>> 
>> 
>> 
> 
> -- 
> Gennaro Tortone
> INFN Napoli
> Italy
> tel: +39 81 676169
> 
> "Computer Science is no more about computers
>    than astronomy is about telescopes."
>    - Edsger Dijkstra

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System