When I want to get the particle position in cell and thread,

c=P_CELL(p); t=P_CELL_THREAD(p);

the following error occurs: ------------------------------------------------------ implicitly declaring function to return int: RP_CELL(). ------------------------------------------------------

Thanks a lot!

Have you included the function RP_CELL in your code before you try to access cell position. There is an example in one of the DPM macro examples in the UDF guide that shows it, without much explanation. (I'm not at my office right now so I can't look it up) - but you should be able to find it.

I have used this for finding the particle position in my code and remember having to include the RP_CELL and I think one other macro.

Thank you very much! I solved my problem even without using RP_CELL, but now I know its usage. My another question is, how to get the particle number and diameter in a cell when particle sizes are different?

Best Regards,

Josh