1248 …if (!ark->imex && tab->stiffly_accurate) { /* Only the stiffly accurate implicit formula is used */  in TSEvaluateStep_ARKIMEX()
1254         if (tab->additive && ark->imex) { /* Method is IMEX, complete the explicit formula */  in TSEvaluateStep_ARKIMEX()
1310   PetscCall(TSComputeIFunction(ts, ts->ptime, ts->vec_sol, Udot, Y1, ark->imex));  in TSARKIMEXTestMassIdentity()
1312   PetscCall(TSComputeIFunction(ts, ts->ptime, ts->vec_sol, Udot, Y2, ark->imex));  in TSARKIMEXTestMassIdentity()
1493 …PetscCall(TSComputeIFunction(ts, t + h * ct[i], Y[i], Ydot, YdotI[i], ark->imex)); /* YdotI = -G(t…  in TSStep_ARKIMEX()
1499           if (ark->imex) {  in TSStep_ARKIMEX()
1838   PetscCall(TSComputeIFunction(ts, time, X, Xdot, F, ark->imex));  in TSARKIMEXComputeAlgebraicIS()
1840   PetscCall(TSComputeIFunction(ts, time, X, Xdot, W, ark->imex));  in TSARKIMEXComputeAlgebraicIS()
1896     PetscCall(TSComputeIFunction(ts, ark->stage_time, Z, X, F, ark->imex));  in SNESTSFormFunction_ARKIMEX()
1901     PetscCall(TSComputeIFunction(ts, ark->stage_time, X, Ydot, F, ark->imex));  in SNESTSFormFunction_ARKIMEX()
1933     PetscCall(TSComputeIJacobian(ts, ark->stage_time, Z, X, shift, A, B, ark->imex));  in SNESTSFormJacobian_ARKIMEX()
1946     PetscCall(TSComputeIJacobian(ts, ark->stage_time, X, Ydot, shift, A, B, ark->imex));  in SNESTSFormJacobian_ARKIMEX()
2094       flg = (PetscBool)!ark->imex;  in TSSetFromOptions_ARKIMEX()
2096       ark->imex = (PetscBool)!flg;  in TSSetFromOptions_ARKIMEX()
2310   ark->imex = (PetscBool)!flg;  in TSARKIMEXSetFullyImplicit_ARKIMEX()
2319   *flg = (PetscBool)!ark->imex;  in TSARKIMEXGetFullyImplicit_ARKIMEX()
2404   ark->imex = dirk ? PETSC_FALSE : PETSC_TRUE;  in TSCreate_ARKIMEX()