Hello, I have a matrix of 10x10 .pdb files, and I need to calculate the RMSD from each PDB file to every other PDB file in that matrix. When I do this in the command line of Chimera, I type something like "match #0 #1" or "match #0 #2" for each of my PDB files, but I would like to automate this process so that it does not take as long. I have hundreds of files and they are all are named similarly (file_1.pdb, for example) but they are not numbered consecutively (file_1.pdb, file_17.pdb, file_43.pdb, for example). If possible, I would like the RMSD values to be output into a CSV file so that I can open it in excel. I have very little experience writing scripts and no idea where to begin to write this one, so I would greatly appreciate any help. I have been reading some of the responses given to other people regarding similar scripts, but I am having a hard time translating that to what I would like to do. Thank you very much, Ruthie