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Re: Analysis macro - trunk rev21003 [message #15265 is a reply to message #15257] Tue, 20 August 2013 13:55 Go to previous message
Lu Cao is currently offline  Lu Cao
Messages: 77
Registered: February 2013
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From: *

It happened in my case before, when some diagonal matrix elements had too small value, e.g. 2.2204e-16. They make the whole matrix close to be "singular"; then it can not be properly diagonalized to solve the eigen problem of chi2 and fails to get a better fitted parameter in the current iteration.

If there are too many these messages, the resolutions are always far away from the expectation in my analysis due to poor kinematics.

Best regards,

[Updated on: Tue, 20 August 2013 13:55]

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