[daip] aips_gripe

[Leonia Kogan]

Continuing my previous message. Probably you mean some pixels of one image 
are blank.

The COMB COMB permits to add maps and if one is blank
COMB uses values from the other normalizing the coefficients.

You want to exlude the normalization at the case of one map's pixel is blank.
I think it is not good idea.

COMB changes the coefficients (C1, C2) to C1//(C1+C2), C2/(C1+C2)
at the normalization and gives at 
the output= C1/(C1+C2)*IN1 +C2/(C1+C2)*IN1= IN1. 
This is a right decision! Is not it?

Excluding normalization you get output = (C1+C2)*IN1. Do you want it?

Leonia


------------------------------------------------------------------
Lincoln,

You wrote about COMB:

>I would like to ask that COMB permit me to add maps and if one is blank
>use values from the other.  This would be the same as using MEAN with
>aparm(1) & aparm(2)=1 but with no normalization. 

What do you mean "one is blank". You have only one image at the input or 
some pixels of one image are blank.

Thanks

Leonia

PS Have you received my recent messsage about the new XMOM?





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>From daip-admin at donar.cv.nrao.edu Fri Nov  9 17:36 MST 2001
From: Lincoln Greenhill <lincoln at rglinux2.harvard.edu>
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{09-NOV-2001 19:25:28}
{rglinux2     rglinux2}
{   24  31DEC01  LINX}
{lincoln greenhill}
{CfA}
{617 495 7194}
{Installment #3 after a long week.  I do apologize for cluttering your mail.
 COMB does in fact behave the way I feared.  For MEAN, the two maps are
 multiplied by normalized coefs (aparm(1) & aparm(2)). This normalization
 occurs in PCOMBN and is passed back to the program as well as being
 written out in a msg.  This behavior is understandable given the name of
 the opcode.
  
 I would like to ask that COMB permit me to add maps and if one is blank
 use values from the other.  This would be the same as using MEAN with
 aparm(1) & aparm(2)=1 but with no normalization.  Perhaps a new aparm
 will make this possible.
  
 doubly sorry.
  }
{COMB installment #3. Long week.  Second mail was wrong. New COMB aparm request.}
{greenhill at cfa.harvard.edu}
{ }
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