THE SUBROUTINE Jac

The form of this subroutine depends on the choice of Info(5) and Info(6). If Info(5)=0, a dummy form of Jac suffices  

When Info(5) = l, Jac may be organized as in the following pseudocode Subroutine Jac ( t, Nstvar, U, Pdwork, Rpar, Ipar, Irange, Imodel, 

This subroutine calculates the nonzero elements of df/du, for use by DDAPLUS in computing G t to) or G(to) for systems with dE/du = 0. Jac is executed only if MAIN sets lnfo(5) to 1 before calling DDAPLUS. 

If dEjdvtA- is nonzero, set lnfo(5)=0 and use the dummy form of Jac given above. 

Insert the nonzero elements dfifduj into Pdwork  

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