diff --git a/src/common_io.c b/src/common_io.c index 56008c763a67d6782579a2aaaba0690ac390882b..5f345b2ac5f2c4f8472a5bcd225dc177ead03591 100644 --- a/src/common_io.c +++ b/src/common_io.c @@ -487,7 +487,11 @@ void prepare_dm_gparts(struct gpart* gparts, int Ndm) { /* Let's give all these gparts a negative id */ for (int i = 0; i < Ndm; ++i) { - gparts[i].id = -abs(gparts[i].id); + + /* 0 ir negative ids are not allowed */ + if(gparts[i].id <= 0) error("0 or negative if for DM particle"); + + gparts[i].id = -gparts[i].id; } }