Confusion about transient adjoint sensitivity analysis

[lichenxi...@gmail.com]

Dear Xyce developers, I am a graduate student in the Department of Computer Science. I am very interested in Xyce, and at the same time, I am amazed at the work of Xyce. Amazing work!
  I'm currently learning about transient analysis and transient adjoint sensitivity analysis in Xyce. I am confused about the data exchange between the two, are the Jacobian matrices (dF/dx, dQ/dx) and dF/dp in the transient adjoint sensitivity analysis directly derived from the transient analysis? Does Xyce need to keep this data in memory after the transient analysis is over? About solutionHistory, stateHistory and storeHistory, what are stateHistory and storeHistory used for?
  I would be very grateful if I could get your answer!