CASA Contributed Script: getgain: Difference between revisions
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Download script: [[File:Getgain.py]] | Download script: [[File:Getgain.py]] | ||
This utility reads the EVLA GainCurves file and make a plot for a specified antenna and band. It is meant to run inside of casa, but is located in its own file but in the same directory as analysisUtils.py (and is also attached below). There are | This utility reads the EVLA GainCurves file and make a plot for a specified antenna and band. It is meant to run inside of casa, but is located in its own file but in the same directory as analysisUtils.py (and is also attached below). | ||
Here is the usage: | |||
<pre> | |||
getgain(myAntenna, myBand, myElev=60, tableLocation='') | |||
</pre> | |||
There are 2 required arguments. The first argument is the antenna: either an integer number (1..28, 29=PieTown, 30=all, and 0=mean) or a string name in the form of 'ea03'. The second argument is the band letter: 4, P, L, S, C, X, U, K, A, Q. Note that 'S' band (as of May 2012) has no entries. An optional third argument is the elevation (in degrees) for which to report the gain. An optional fourth argument is the path to the GainCurves file, which is assumed to be $CASAPATH/data/nrao/VLA/GainCurves. | |||
[[Image:Gaincurve.K.3.png|200px|thumb|right|gain curve of ea03 at K-band]] | [[Image:Gaincurve.K.3.png|200px|thumb|right|gain curve of ea03 at K-band]] | ||
Here is an example: | |||
<source lang="python"> | <source lang="python"> | ||
# In CASA | # In CASA | ||
Revision as of 19:31, 1 May 2013
Plotting VLA gain tables
Download script: File:Getgain.py
This utility reads the EVLA GainCurves file and make a plot for a specified antenna and band. It is meant to run inside of casa, but is located in its own file but in the same directory as analysisUtils.py (and is also attached below). Here is the usage:
getgain(myAntenna, myBand, myElev=60, tableLocation='')
There are 2 required arguments. The first argument is the antenna: either an integer number (1..28, 29=PieTown, 30=all, and 0=mean) or a string name in the form of 'ea03'. The second argument is the band letter: 4, P, L, S, C, X, U, K, A, Q. Note that 'S' band (as of May 2012) has no entries. An optional third argument is the elevation (in degrees) for which to report the gain. An optional fourth argument is the path to the GainCurves file, which is assumed to be $CASAPATH/data/nrao/VLA/GainCurves.
Here is an example:
# In CASA
CASA <4>: execfile('getgain.py') or from getgain import *
CASA <5>: getgain(3,'K',45.0)
elev=45.000000
band=K
antenna=3
current time = 4829398371.042835
Using table = /usr/lib64/casapy/release/data/nrao/VLA/GainCurves
There are 250 rows with band K
There are 8 rows with antenna 3 and band K: 475 532 558 587 616 645 673 703
Using row number 703
gain=1.026696 at ZA=45.0 or EL=45.0
Plot stored in gaincurve.K.3.png
