Failed to determine covariance matrix in uvfit
Posted: Fri May 31, 2019 12:05 pm
Hi,
From my previous post I'm attempting to measure the flux of my target with uvfit.
Upon the previous suggestion to implement: uvfit vis=myvis line=chan,200,1,10,10 object=point
I receive the following errors:
uvfit: Revision 1.10, 2013/08/30 01:49:21 UTC
Reading the data ...
Applying bandpass corrections to hd100453.33000
Applying gain corrections to hd100453.33000
### Warning: Performing linetype averaging before applying bandpass!!
### Warning: ... this may be very unwise
Total number of correlations: 16472030
Performing the fitting process ...
### Warning: Failed to determine covariance matrix
------------------------------------------------
RMS residual is 6.648E-02
Source 1, Object type: point
Flux: 0.000
Offset Position (arcsec): 0.0000 0.0000
------------------------------------------------
I'm unsure why I'm receiving the bandpass error even though the uvfit task prints the bandpass solution is being applied and more importantly, I'm unsure why determining the covariance matrix fails and I receive a zero flux reading.
Any suggestions would be greatly appreciated.
Thanks,
Brodie
From my previous post I'm attempting to measure the flux of my target with uvfit.
Upon the previous suggestion to implement: uvfit vis=myvis line=chan,200,1,10,10 object=point
I receive the following errors:
uvfit: Revision 1.10, 2013/08/30 01:49:21 UTC
Reading the data ...
Applying bandpass corrections to hd100453.33000
Applying gain corrections to hd100453.33000
### Warning: Performing linetype averaging before applying bandpass!!
### Warning: ... this may be very unwise
Total number of correlations: 16472030
Performing the fitting process ...
### Warning: Failed to determine covariance matrix
------------------------------------------------
RMS residual is 6.648E-02
Source 1, Object type: point
Flux: 0.000
Offset Position (arcsec): 0.0000 0.0000
------------------------------------------------
I'm unsure why I'm receiving the bandpass error even though the uvfit task prints the bandpass solution is being applied and more importantly, I'm unsure why determining the covariance matrix fails and I receive a zero flux reading.
Any suggestions would be greatly appreciated.
Thanks,
Brodie