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<== Date ==> <== Thread ==>

Subject: Re: regarding CaChannel v1.6 handling of dynamic subarrays
From: Burkhard Kolb <b.kolb@gsi.de>
To: Ritesh Sugandhi <ritesh.sugandhi@gmail.com>
Cc: tech-talk@aps.anl.gov
Date: Thu, 28 Apr 2011 16:43:53 +0200
Hi Ritesh,

there are several threads in tech-talk discussing this subarray issue. You always have to allocate with
MALM the size of the original array because Channel Access always transports the full array, the move
of the subarray is done on the client side.
Please use the search in tech-talk field on the EPICS home page - it saves you a lot of guessing and
asking...

Cheers, Burkhard
--
Dr. Burkhard Kolb
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Am 28.04.2011 um 16:23 schrieb Ritesh Sugandhi:

Dear Mr. Martin ,

thanks for your reply

Yes, I am gettiing 16 elements correctly for each subarray but have zeros on elements 17 - 63 for each subArray.

I have put MALM for each subarray as 16 ( same as NELM = 16). Now the element count is coming correct but data in subArray2,3,4 is not correct.

The output now is 

(64, [0.27133380897133985, 0.79951261848013366, 0.10564437214412981, ... 0.9708053208969406])

('subarrays = 1', 16, [0.27133380897133985, ......., 0.66130227225711835])
('subarrays = 2', 16, [0.66130227225711835, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0])
('subarrays = 3', 16, [0.66130227225711835, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0])
('subarrays = 4', 16, [0.66130227225711835, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0])

Thanks again for anticipated suggestions,

Best regards,
Ritesh Sugandhi



On Thu, Apr 28, 2011 at 2:45 PM, Martin L. Smith <mls@aps.anl.gov> wrote:
In your subArray record set the MALM field to the same as the NELM field.
According to the record reference manual under the heading Array Parameters
the MALM field is used to allocate the memory for the array. It looks like
you are getting the 16 elements correctly but have zeros on elements 17 - 63
for each subArray.

See if this helps,
Marty


Ritesh Sugandhi wrote:
Dear sir

I am having a array of double consist of 64 elements and connected to 4 sub-arrays of size 16. I assigned the random numbers to main array . now when I take elements count for each subarray array and display its output. I got each sub-array is assigned with the 64 elements (instead of 16) and appended by 0 at the end elements .

The code output and database schema is included in mail. Please correct if my understanding is not correct.

Thanking you and Best regards,

Ritesh Sugandhi


*Output is as below::*
 
(64, [0.15680341096341543, …0.27939076994606538])

('subarrays = 1', 64, [0.15680341096341543,…, 0.6660663007380897,0.0,…. 0.0])

('subarrays = 2', 64, [0.87466558395868221,… 0.59892465207930756, 0.0,  …., 0.0])

('subarrays = 3', 64, [0.20673443822330728,…., 0.34672371303892258, 0.0,… 0.0])

('subarrays = 4', 64, [0.47304895704158478,…, 0.27939076994606538, 0.0, ….0.0])

[sugandr@trunk pydev]$

*code is as below::*

from CaChannel import *
import random

driver = CaChannel()
driver.searchw('Py:wave_test')
sub1   = CaChannel()
sub1.searchw('Py:subArr1')
sub2   = CaChannel()
sub2.searchw('Py:subArr2')
sub3   = CaChannel()
sub3.searchw('Py:subArr3')
sub4   = CaChannel()
sub4.searchw('Py:subArr4')

#put randome number in driver
driver.putw([random.random() for x in range(64)])

print(driver.element_count(), driver.getw())

print('subarrays = 1', sub1.element_count(),sub1.getw())
print('subarrays = 2', sub1.element_count(),sub2.getw())
print('subarrays = 3', sub1.element_count(),sub3.getw())
print('subarrays = 4', sub1.element_count(),sub4.getw())

EPICS environment is 3.14.12 and RHEL 5.5  64 bit version using CaChannel v1.6 library

Data base schema is
record(subArray, "$(P)subArr1") {   field(NELM, "16")
 field(INP, "$(P)wave_test.VAL")
 field(INDX, "0")
 field(FTVL, "DOUBLE")
 field(MALM, "64")
}

record(subArray, "$(P)subArr2") {    field(NELM, "16")
 field(INP, "$(P)wave_test.VAL")
 field(INDX, "16")
 field(FTVL, "DOUBLE")
 field(MALM, "64")
}

record(subArray, "$(P)subArr3") {
 field(NELM, "16")
 field(INP, "$(P)wave_test.VAL")
 field(INDX, "32")
 field(FTVL, "DOUBLE")
 field(MALM, "64")
}

record(subArray, "$(P)subArr4") {
 field(NELM, "16")
 field(INP, "$(P)wave_test.VAL")
 field(INDX, "48")
 field(FTVL, "DOUBLE")
 field(MALM, "64")
}

record(fanout, "$(P)mylinker") {
 field(FLNK, "$(P)subArr1")
 field(LNK1, "$(P)subArr3")
 field(LNK2, "$(P)subArr2")
 field(LNK3, "$(P)subArr4")
}

record(waveform, "$(P)wave_test") {
 field(NELM, "64")
 field(FTVL, "DOUBLE")
 field(EGU, "Counts")
 field(SCAN, "Passive")
 field(FLNK, "$(P)mylinker")
}






Replies:
Re: regarding CaChannel v1.6 handling of dynamic subarrays Ritesh Sugandhi
References:
regarding CaChannel v1.6 handling of dynamic subarrays Ritesh Sugandhi
Re: regarding CaChannel v1.6 handling of dynamic subarrays Martin L. Smith
Re: regarding CaChannel v1.6 handling of dynamic subarrays Ritesh Sugandhi

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