Hello!I have to solve a system of ODE describing a Newtonian dynamics of some complex object. I decided to use the Intel ODE solver for this.I have coded my subroutine in a framework of Runge-Kutta 4rd order. It works perfectly. But I would like to use more adapted libraries for Intel processor performing calculations in a work-station.I downloaded the Intel ODE solver and extracted it respectively to installation manual. The example code was built successful.Let`s talk about my problem closely.I have coded an interface to the *dodesol_rkm9st* subroutine in a MODULE (see attached a file: *subroutine interface2dodesol_motion(traj)*).This subroutine accepts a derived type variable "*traj*". Then a subroutine "*cartes2y*" translates one to y-vector of length n (initial values for *dodesol_rkm9st*).After that a resulting y-vector is returned and it is translated back to "traj" using *y2cartes*.If I understand exactly this will solve my problemcorrectlywith an arbitrary arrange of variables. I just must organize an explicit accept to variables and their interaction between y-vector and rhs-subroutine.Furthermore, about rhs-subroutine.In this subroutine I use an external "*derivate*" subroutine which returns *dU*-values. They are used in the calculation of the f(i) RHS functions.If I declare it like external (acording to the manual) I have the following error:/tmp/ipo_ifortpDFulI3.o: In function `iode_solver_mp_rhs_motion_':ipo_out3.f:(.text.hot00022+0xb46): undefined reference to `derivate_'and the executable file is not linked. Without a declaration of "derivate" the executable is linked successful.But when I run it and test the results I see no changes in the values of y-vector (respectively to the machine accuracy [1.d-20 ; 1.d-8]).I want to have an *one-step solution*. I mean I would like *to propagate* y-vector from moment t to t+dt (t - undepended variable, dt - step).The rhs depends on y-vector inexplicitly by derivate-subroutine.Finaly.1. I hope this is not the problem with transfer of variables into Intel ODE solver which is argued before.2. Do you know some way of using external subroutines in RHS subroutine?3. I tested dodesol_rkm9st, dodesol_mk52lfn, dodesol_rkm9mkn --- without any success.

# Interface to dodesol_rkm9st

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