Hi Gourav, You must be looking at the help for ChimeraX. Chimera and ChimeraX are two different programs, and Chimera does not have "hide" or "undo." If you want to use these commands, get UCSF ChimeraX instead. (There is also a different mailing list for ChimeraX questions, if you have any in the future: chimerax-users@cgl.ucsf.edu ) Regards, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Resource for Biocomputing, Visualization, and Informatics Department of Pharmaceutical Chemistry University of California, San Francisco

On Jan 3, 2024, at 9:25 AM, Gourav Das via Chimera-users <chimera-users@cgl.ucsf.edu> wrote:

Greetings everyone!

I am trying to hide the hydrogen atoms of a molecule using the command line in Chimera. But the software does not recognize the "hide" command. In addition, it could not recognize the "undo" command. Please help me regarding this issue.

With regards,

Gourav Das Research Scholar Department of Chemistry IIT Kharagpur India

Hi Gourav, Chimera does not have undo. Of course, you can hide any atoms that you want. You can use the menu or commands. Menu: Select... Chemistry... element... H Actions... Atoms/Bonds... hide The command in Chimera to hide atoms is ~display, so you could try: ~disp H (using atomic symbol H to specify by element) See help pages for Chimera menu, the Chimera "display" command, and how to specify atoms in the command line: <https://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/menu.html> <https://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/display.html> <https://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/frameatom_spec.html> For other topics or just to learn the program, see the Chimera User Guide and tutorials: <https://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/index.html> <https://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/frametut.html> However, you may want to try ChimeraX instead. We are not developing Chimera any more, so new improvements and new features are only going into ChimeraX. ChimeraX has its own website, User Guide, tutorials, etc. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Resource for Biocomputing, Visualization, and Informatics Department of Pharmaceutical Chemistry University of California, San Francisco

On Jan 3, 2024, at 10:06 AM, Gourav Das via Chimera-users <chimera-users@cgl.ucsf.edu> wrote:

Dear Elaine,

Thank you very much for the clarification. But is there any way to hide hydrogen atoms and undo any action in Chimera? I would greatly appreciate your valuable response.

Best regards, Gourav