[daip] blanking in COMB

Leonia Kogan lkogan at aoc.nrao.edu
Tue Nov 25 15:41:55 EST 2003


Hi,

I have solved the problem for Greg.

Greq concerned about the following line in COMB.FOR:

         BLANK = (V1(I).EQ.FBLANK) .OR. (V2(I).EQ.FBLANK) .OR.
     *      (ABS(V1(I)).LT.FMAX1) .OR. (ABS(V2(I)).LT.FMAX2) .OR.
     *      (V1(I).LE.C(5)) .OR. (V2(I).LE.C(6))

C(5) = APARM(5); C(6)=APARM(6).

APARM(5) and APARM(6) are thresholds for the first and second maps.
The last row shows that if MAP1 or MAP2 are less the relevant thresholds 
then the output point value is blank.

Greg did not print anything in APARM(5),APARM(6) and as result got 
APARM(5)=APARM(6)=0 and got expected result:
all negative points either in MAP1, or MAP2 are blanked.

Leonia
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Hi All,

   When using opcode 'OPTD', COMB seems to be testing the value of 

MAP(1) and MAP(2)

and if either are negative, blanking it.  This isn't correct.  What it
should be (and from looking at the code does seem to be) testing is:

(A(3)*MAP(1)/MAP(2) + A(4)) 

which is the expression inside the logarithm.  I've managed to work around
this, but it took me about an hour to figure out what was going on.
Ciao,
                                             - Greg

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