have problem with the mass matrix

[neallee]

Hi， silvia and frank,
Happy new year! Thank you!

some SOE classes, inheritance from the EigenSOE class, have the private member *M and some Solver classes have the pointer *Mptr

but, in my tracking debugging procedure, i found that there is no numerical assignment to that Matrix - M.
Only the M matrix has been set to be zero.

so, can you help me by introducing some information about that where is the matrix storage in Ops .exe?
the global and local matrix storage strategy?? K, M , C, and Force or B Vector???

thank you!

best regards,

Ning.