[daip] Issue with FLATN (AIPS 2023) {External}

[Eric Greisen]

Curious - the issue appears to be an optimization problem on Macs.  I will look to see if I can find a fix but you could try compiling and linking $APGOOP/FLATN with DEBUG NOOPT specified.

Why did you do a text installation - are you writing AIPS code?  This fix of course is only possible
because you did.  Furthermore, the issue is in some linked in subroutine so you will need to have
build the system with debug libraries and use them in your link edit.

Eric Greisen
________________________________
From: Daip <daip-bounces at listmgr.nrao.edu> on behalf of Arti Goyal via Daip <daip at listmgr.nrao.edu>
Sent: Thursday, September 5, 2024 2:25 AM
To: aipsmail <aipsmail at nrao.edu>
Subject: [daip] Issue with FLATN (AIPS 2023) {External}


Dear colleague,



I have text installed AIPS 2023 on my Macbook Pro and it’s running smoothly. I am encountering a problem while running the task FLATN. Here I want to interpolate 25 fields into one as I have performed a wide-field imaging (610 MHz data from GMRT telescope in India).  The problem is that the task starts but doesn’t finish no matter how long I let take and I need to abort to get the terminal back. The resulting FLATNed image is junk without any intensities.



##

LOCALH> FLATN1: Task FLATN  (release of 31DEC23) begins

LOCALH> FLATN1: Create HDFN        .FLATN .   1 (MA)  on disk  1  cno  361

LOCALH> FLATN1: Field     1 included blc,trc   253  2247   773  2767

LOCALH> FLATN1: ZABORS: signal 15 received

LOCALH> FLATN1: ABORT!



##

The image header of the FLATNed image:



AIPS 1: Got(1)   disk= 1  user= 100   type=MA   HDFN.FLATN.1

AIPS 1: Image=HDF-N     (MA)         Filename=HDFN        .FLATN .   1

AIPS 1: Telescope=GMRT               Receiver=GMRT

AIPS 1: Observer=TOM                 User #=  100

AIPS 1: Observ. date=01-APR-2007     Map date=04-SEP-2024

AIPS 1: Pixel type: FLOATING         Magic value blanking

AIPS 1: Minimum= 1.00000002E+20      Maximum=-1.00000002E+20 JY/BEAM

AIPS 1: ----------------------------------------------------------------

AIPS 1: Type    Pixels   Coord value      at Pixel    Coord incr   Rotat

AIPS 1: RA---SIN  3000    12 36 49.403515  1500.00        -1.380    0.00

AIPS 1: DEC--SIN  3000    62 12 57.973953  1501.00         1.380    0.00

AIPS 1: FREQ         1   6.1737502E+08        1.00  1.375000E+07    0.00

AIPS 1: STOKES       1   1.0000000E+00        1.00  1.000000E+00    0.00

AIPS 1: ----------------------------------------------------------------

AIPS 1: Coordinate equinox 2000.00

AIPS 1: Map type=NORMAL              Number of iterations=    2413

AIPS 1: Conv size=   7.08 X   5.92   Position angle=  28.46

AIPS 1: Rest freq      0.000         Vel type: RADIO   wrt YOU

AIPS 1: Alt ref. value  0.00000E+00  wrt pixel    0.45

AIPS 1: Keyword = 'WTNOISE '  value =  1.13333679D+00

AIPS 1: Keyword = 'SUMWTIN '  value =  1.42178117D+08

AIPS 1: Keyword = 'CCFLUX  '  value =  2.569658E-02

AIPS 1: Keyword = 'CCTOTAL '  value =  1.265699E+00

AIPS 1: Keyword = 'MAXABSU '  value = -1.000000E+00



##

My box file for creating 25 fields is as below:



F 1    512 512  1380   1380

F 2    512 512   690   1380

F 3    512 512  0      1380

F 4    512 512   -690   1380

F 5    512 512   -1380  1380

F 6    512 512  1380   690

F 7    512 512  690    690

F 8    512 512  0       690

F 9    512 512   -690    690

F 10   512 512   -1380   690

F 11   512 512  1380   0

F 12   512 512   690   0

F 13   512 512   0 0

F 14   512 512   -690   0

F 15   512 512   -1380  0

F 16   512 512  1380  -690

F 17   512 512   690  -690

F 18   512 512   0     -690

F 19   512 512   -690  -690

F 20   512 512   -1380 -690

F 21   512 512  1380  -1380

F 22   512 512  690   -1380

F 23   512 512   0    -1380

F 24   512 512  -690  -1380

F 25   512 512  -1380 -1380



##

I will greatly appreciate any help in this regard.



Thank you.



Arti Goyal


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