; DIFUV ;--------------------------------------------------------------- ;! Outputs the difference of two matching input uv data sets ;# TASK UV SINGLEDISH MODELING ;----------------------------------------------------------------------- ;; Copyright (C) 1996-1997, 2007, 2009, 2014 ;; Associated Universities, Inc. Washington DC, USA. ;; ;; This program is free software; you can redistribute it and/or ;; modify it under the terms of the GNU General Public License as ;; published by the Free Software Foundation; either version 2 of ;; the License, or (at your option) any later version. ;; ;; This program is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; ;; You should have received a copy of the GNU General Public ;; License along with this program; if not, write to the Free ;; Software Foundation, Inc., 675 Massachusetts Ave, Cambridge, ;; MA 02139, USA. ;; ;; Correspondence concerning AIPS should be addressed as follows: ;; Internet email: aipsmail@nrao.edu. ;; Postal address: AIPS Project Office ;; National Radio Astronomy Observatory ;; 520 Edgemont Road ;; Charlottesville, VA 22903-2475 USA ;----------------------------------------------------------------------- DIFUV LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC DIFUV Task to difference/divide two matching uv data sets INNAME 1st input UV file name INCLASS 1st UV file class INSEQ 0.0 9999.0 1st UV file seq. # INDISK 0.0 9.0 1st UV file disk # IN2NAME 2nd UV file name. IN2CLASS 2nd UV file class. IN2SEQ 0.0 9999.0 2nd UV file seq. # IN2DISK 0.0 9.0 2nd UV file disk # OUTNAME Output UV file name OUTCLASS Output UV file class OUTSEQ -1.0 9999.0 Output UV file seq. # OUTDISK 0.0 9.0 Output UV file disk #. SOLINT 0.0 How close times must match in minutes OPTYPE 'DIV'=> divide, else subtract FQCENTER >= 0 -> center frequency axis ---------------------------------------------------------------- DIFUV Task: This task writes out the difference or ratio of two UV data sets. It does very little checking to see if they match. One purpose of this task would be to difference the two throws of beam-switched single-dish continuum data. Another use would be to subtract a residual uv data set from the original to produce a model uv data set. The division operation could be used to produce a data set suitable for determining gains. Tables such as calibration (CL, SN), flag (FG), bandpass (BP), etc. are not applied to either data set. The tables of the first data set are copied to the output; the tables of the second data set are ignored. Adverbs: INNAME.....First input UV file name (name). Standard defaults. INCLASS....First input UV file name (class). Standard defaults. INSEQ......First input UV file name (seq. #). 0 => highest. INDISK.....First input UV file Disk drive # . 0 => any. IN2NAME....2nd UV file name subtracted from or divided into the first data set. IN2CLASS...2nd UV file class IN2SEQ.....2nd UV file sequence number. IN2DISK....2nd UV file sequence number. OUTNAME....Output UV file name (name). Standard defaults. OUTCLASS...Output UV file name (class). Standard defaults. OUTSEQ.....Output UV file name (seq. #). 0 => highest unique OUTDISK....Disk drive # of output UV file. 0 => highest with space for the file. SOLINT.....Data are differenced only if times are close. SOLINT sets that limit in minutes. 0 => 0.01 sec. OPTYPE.....'DIV' => do division, else do subtraction. FQCENTER,..> 0 => Change frequency axis reference pixel to Nchan / 2 + 1 else => do not change reference pixel ----------------------------------------------------------------