sdmathold – ASAP SD task [DEPRECATED]: simple arithmetic of spectra – single dish task

Description

### DEPRECATION WARNING ################################################# This task will be removed in CASA 5.1. The functionality of this task with CASA image format is replicated with immath. #########################################################################

Task sdmathold execute a simple arithmetic (i.e., subtraction, addition, multiplication, and division) expression for single dish spectra. The spectral data file can be any of the formats supported by ASAP (scantable, MS, rpfits, and SDFITS). In the expression, these file names should be put inside of single or double quotes.

You can use variables in the expression. If you want to use, you must define varnames dictionary. Name of variables should be simple, e.g. V0, V1, etc., to avoid unexpected error. Keys of varnames must be name of variables that you used in the expression, and their values will be substituted for variables in the expression. Allowed type for the value is numerical values, one- or two-dimensional lists (Python list or numpy.ndarray), and filename strings that indicate spectral data or ASCII text, which is space-separated list of numerical values consisting of adequate number of rows and columns. In case you give a list of file names in infiles, they are automatically referred to as IN0, IN1, etc. in expr and you can not use IN0, IN1, etc. as variable names in varnames.

Parameters

Title

Parameter	Default	Description
infiles	numpy.array( [  ] )
expr	''
varnames	*UNKNOWN*
antenna	int(0)
fluxunit	''
telescopeparam	''
field	''
spw	''
scan	''
pol	''
outfile	''
outform	'ASAP'	output file format ['ASAP', 'MS2', 'ASCII', or 'SDFITS']
overwrite	False

Parameter Explanations

infiles

numpy.array( [  ] )

a list of names of input SD datasets

expr

''

mathematical expression using spectra

varnames

*UNKNOWN*

dictionary of variables and their values used in expr

antenna

int(0)

select an antenna name or ID, e.g. 'PM03' (only effective for MS input)

fluxunit

''

units of the flux (''=current)

telescopeparam

''

parameters of telescope for flux conversion (see examples in help)

field

''

select data by field IDs and names, e.g. '3C2*' (''=all)

spw

''

select data by IF IDs (spectral windows), e.g. '3,5,7' (''=all)

scan

''

select data by scan numbers, e.g. '21~23' (''=all)

pol

''

select data by polarization IDs, e.g. '0,1' (''=all)

outfile

''

name of output file (must be specified)

outform

'ASAP'

output file format (See a WARNING in help)

overwrite

False

overwrite the output file if already exists [True, False]