[BUG] for_set command

[Grandtough]

Summary

<error appear when set atoms image with set group group-ID image -1 NULL NULL>

22 Jul 2025 - Update 2

There always an error states "ERROR: Expected integer parameter instead of 'NULL' in input script or data file (src/set.cpp:1667)" when I set the images for atoms, the command like:

include ../modulein/str/header.in
read_data ./00data/spc.data
variable param_label string no
include ../modulein/str/common_str.in

variable choosen_atoms atom mol==76
group choosen_atoms variable choosen_atoms

set group choosen_atoms image NULL -1 NULL
set group choosen_atoms image NULL NULL -1
set group choosen_atoms image -1 NULL NULL

the two fomer set command work well but the last has an error

variable choosen_atoms atom mol==76
group choosen_atoms variable choosen_atoms
3 atoms in group choosen_atoms

set group choosen_atoms image NULL -1 NULL
Setting atom values ...
3 settings made for image
set group choosen_atoms image NULL NULL -1
Setting atom values ...
3 settings made for image
set group choosen_atoms image -1 NULL NULL
ERROR: Expected integer parameter instead of 'NULL' in input script or data file (src/set.cpp:1667)
Last input line: set group choosen_atoms image -1 NULL NULL

Expected Behavior

Actual Behavior

Steps to Reproduce

**The lammps version:

LAMMPS Stable Release	22 Jul 2025

**

[akohlmey]

@Grandtough thanks for reporting this bug. The following change should resolve it. We will included it in the next update release.

  diff --git a/src/set.cpp b/src/set.cpp
  index 588f3bc103..5819e66b9f 100644
  --- a/src/set.cpp
  +++ b/src/set.cpp
  @@ -1656,7 +1656,7 @@ void Set::process_image(int &iarg, int narg, char **arg, Action *action)
       }
     }
   
  -  if (strcmp(arg[iarg+1],"NULL") == 0) action->ivalue6 = 0;
  +  if (strcmp(arg[iarg+3],"NULL") == 0) action->ivalue6 = 0;
     else {
       action->ivalue6 = 1;
       if (utils::strmatch(arg[iarg+3],"^v_")) {

[Grandtough]

Thanks for your reply ✧٩(ˊωˋ*)و✧