CVODES returns at wrong time when integrating backwards

[balos1]

CVODES returns at wrong time when integrating backwards

[balos1]

From a brief look, I think what is happening is that CVODES sets the stop time when integrating backwards, but the tstop interp check is guarded by (tout - cv_mem->cv_tstop) * cv_mem->cv_h >= ZERO to ensure tout >= tstop which is obviously false when tout < tstop as it may be when integrating backwards.

[gardner48]

I believe this is a duplicate of #339 and should be fixed by #349 in v6.7.0 (the reporter is using v6.6.2). I've asked them to try v6.7.0 and let us know if the problem persists.

The check (tout - cv_mem->cv_tstop) * cv_mem->cv_h >= ZERO is correct as the multiplication by cv_h accounts for the direction of integration.

[balos1]

Closed as a duplicate