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[Bruno Chareyre <question662276@xxxxxxxxxxxxxxxxxxxxx>]

Question #662276 on Yade changed:
https://answers.launchpad.net/yade/+question/662276

Bruno Chareyre proposed the following answer:
Back to the original statement:
"Qin= -7.87821707663e-07 Qout= 7.87395513513e-07.........>>>>> Qin is not completely equal to Qout.???"

They cannot be equal since:
1- they result from a (lot of) calculations which all generate numerical errors, including the Cholesky factorization of a linear system.
2- they are theoretically equal only if the solid phase is fixed, in the script there is a residual momentum resulting from the compaction phase.
The difference is of the order of 5e-4*Q. That's quite ok given 1/ and 2/

Bruno

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