Re: subArray processing

["J. Lewis Muir" <jlmuir@anl.gov>]

On 6/3/09 8:23 AM, Hinko Kocevar wrote:
> Steven M. Hartman wrote:
>> Hinko Kocevar wrote:
>>> Hello,
>>>
>>> I'm trying to use subArray record type to display each array element at
>>> index 0 .. n (n == 10; my case) in a separate PV.
>>>
>>
>> For your subArray records, use . . .
>>
>>   field(MALM,"16") # number of elements of the waveform input
>>   field(NELM,"1")  # number elements for desired subArray
>>
>> The subArray needs to allocate enough storage for MALM elements to  hold
>> the whole INP waveform, but you only want NELM elements for the subArray
>> itself.
>>
> 
> If I change subArray records the way you described it does not change
> the output of the monitor to display only one value. The output is the
> same as in the case I've described in previous mail (not desired to have
> trailing zeros).

Hi, Hinko.

I agree with Steven's advice that you should use MALM=16 for your
subArray records.

What version of EPICS are you using?  There is a known problem with the
subArray record before EPICS 3.14.10.  Could you check the value of
"$(DEVICE)B.INDX" during your test?  Has it been set to 0 even though
you specified a value of 1?  If so, you may be running into the problem
reported in the following Tech-Talk message:

  http://www.aps.anl.gov/epics/tech-talk/2007/msg01432.php

Lewis

-- 
J. Lewis Muir
Software Engineer
CARS/IMCA-CAT