Experimental Physics and
Industrial Control System

Looks like you have dimensioned your subArrays to have 16 elements.  caget reports all 16 values even if only first four have been populated.

Zen

> -----Original Message-----
> From: [email protected] [mailto:tech-talk-
> [email protected]] On Behalf Of Zhang, Jihong (Julia)
> Sent: Tuesday, January 18, 2011 1:52 PM
> To: '[email protected]'
> Cc: Zhang, Jihong (Julia)
> Subject: About subArray trailing zeros
> 
> Hello,
> 
> I'm trying to use subArray record type to split up a larger waveform record
> into smaller waveforms:
> I am starting with a waveform record with 16 elements:
> 
> The first subArray is at index 0
> The second subArray is at index 4
> The 3rd subArray is at index 8
> The 4th subArray is at index 12
> 
> I have a question on the trailing zeros. why does caget report trailing zeros; is
> this a bug?
> 
> The following is the simple testing for this problem:
> 
> ==============output for the simple testing:
> caput -a wave_test 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Old : wave_test
> 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 New : wave_test 16 1 2 3 4 5 6 7 8 9 10 11 12
> 13 14 15 16
> 
> caget subArr1
> subArr1 16 1 2 3 4 0 0 0 0 0 0 0 0 0 0 0 0  /* I only need the first 4 numbers,
> no training 0 */
> 
> caget subArr2
> subArr2 16 5 6 7 8 0 0 0 0 0 0 0 0 0 0 0 0
> 
> caget subArr3
> subArr3 16 9 10 11 12 0 0 0 0 0 0 0 0 0 0 0 0
> 
> caget subArr4
> subArr4 16 13 14 15 16 0 0 0 0 0 0 0 0 0 0 0 0
> 
> =============Db definition for the simple testing:
> 
> record(subArray, subArr1) {
>   field(DESC, "ayb array 1")
>   field(NELM, "4")
>   field(INP, "wave_test.VAL")
>   field(INDX, "0")
>   field(FTVL, "SHORT")
>   field(MALM, "16")
> }
> 
> record(subArray, subArr2) {
>   field(DESC, "ayb array 2")
>   field(NELM, "4")
>   field(INP, "wave_test.VAL")
>   field(INDX, "4")
>   field(FTVL, "SHORT")
>   field(MALM, "16")
> }
> 
> record(subArray, subArr3) {
>   field(DESC, "ayb array 3")
>   field(NELM, "4")
>   field(INP, "wave_test.VAL")
>   field(INDX, "8")
>   field(FTVL, "SHORT")
>   field(MALM, "16")
> }
> 
> record(subArray, subArr4) {
>   field(DESC, "ayb array 4")
>   field(NELM, "4")
>   field(INP, "wave_test.VAL")
>   field(INDX, "12")
>   field(FTVL, "SHORT")
>   field(MALM, "16")
> }
> 
> record(fanout, mylinker) {
>   field(FLNK, "subArr1")
>   field(LNK1, "subArr3")
>   field(LNK2, "subArr2")
>   field(LNK3, "subArr4")
> }
> 
> record(waveform, wave_test) {
>   field(NELM, "16")
>   field(FTVL, "SHORT")
>   field(EGU, "Counts")
>   field(SCAN, "Passive")
>   field(FLNK, "mylinker")
> }
> 
> 
> Thanks.
> 
> Julia Zhang
> 

References:

About subArray trailing zeros Zhang, Jihong (Julia)

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