./guide
accum.pro

Last modification date:

Thu Jun 2 23:56:08 2005

accum

procedure accum[, accumnum], [weight=float], [dc=spectrum or integer]

This procedure adds a data container to the accum buffer, in preparation for averaging. The PDC (!g.s[0]) is used by default but an alternate data container can be specified using the 'dc' keyword.

The first data container accum'ed in each buffer is used as a template for that buffer and subsequent data containers accum'ed to that buffer must match in number of channels and frequency range.

There are four accum buffers available to that the user can average polarizations simultaneously, but separately, if it is desired to do so.

See: accum.pro

Examples

A simple averaging operation:

   sclear
   getrec,1
   accum
   getrec,2
   accum
   ave
 

Average two polarizations separately for some position switched scans

   sclear                  ; clears accum buffer 0
   sclear, 1               ; clears accum buffers 1
   getps,32,plnum=0
   accum, 0
   getps,32,plnum=1
   accum, 1
   getps,34,plnum=0
   accum, 0
   getps,34,plnum=1
   accum, 1
   ave,1                   ; Average plnum=1 data and store
                           ;  the result in the PDC
   copy,0,1                ; Copy the result to DC 1
   ave, 0                  ; Average plnum=0 data
   oshow, 1                ; Overplot the plnum=1 average
 

Uses

dcaccum

Code

accum.pro

Version

$Id: accum.pro,v 1.16 2005/06/02 17:09:44 bgarwood Exp $

Parameters
accumnum in, optional integer (def. 0)	accum buffer. Defaults to the primary buffer (accumnum = 0). There are 4 buffers total so this value must be between 0 and 3, inclusive.

Keywords
weight in, optional float	The weight to use for averaging this data. If not set, a weight of exposure/Tsys^2 is used.
dc in, optional spectrum or integer	The data container to accum. If not supplied, use !g.s[0]. If this is an integer, then use the data container at that index number in !g.s.