XYZ position when p->stream_index=-1

Kelly

Hi,

I am using DPM model to calculate particle trajectories. I know I can use p->stream_index = -1 to stop the trajectory calculation. If I need to write out the positions such as x,y,z corordinates right at the time of this setting (p->stream_index = -1), what can I do for this purpose? I tried but all the data related with this particle was removed by setting p->stream_index = -1. Thanks.