PETSc version 3.15.4
Adds (X-Xprev) and (F-Fprev) updates to an LMVM matrix. The first time the function is called for an LMVM matrix, no update is applied, but the given X and F vectors are stored for use as Xprev and Fprev in the next update.
PetscErrorCode MatLMVMUpdate(Mat B, Vec X, Vec F)
If the user has provided another LMVM matrix in place of J0, the J0
matrix is also updated recursively.
|B ||- An LMVM-type matrix
|X ||- Solution vector
|F ||- Function vector
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