Experimental Physics and
Industrial Control System

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

Replies:

Re: histogram record and CSS XY Graph Kasemir, Kay

References:

histogram record and CSS XY Graph [email protected]

Re: histogram record and CSS XY Graph Kasemir, Kay

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