Hi Aditya, I think the issue here is that you don't do anything to specify what folder you are writing "sas111.txt" in. For instance, on the Mac if you start Chimera by double-clicking then the "current folder" is /, which you almost certainly don't have write permission for. So instead of opening just "sas111.txt" you need to specify the full path to the file, e.g.: out = open("/Users/aditya/sas111.txt", "a") Along the same lines, this code will always write sas111.txt in your home folder: from os import expanduser out = open(expanduser("~/sas111.txt"), "a") --Eric Eric Pettersen UCSF Computer Graphics Lab http://www.cgl.ucsf.edu On Jan 28, 2011, at 4:04 AM, Aditya Padhi wrote:

Hi Elaine, Hope you are fine. If you remember I was calculating per residue SASA using Chimera for my MD simulated protein. At that time it was working fine. But I did some more simulation run and now I want to calculate SASA for the entire trajectory but unfortunately Its showing the following error.

Error Problem in per-frame script: IOError: [Errno 13] Permission denied: 'sas111.txt'

File "<string>", line 3, in <module>

See reply log for Python traceback.

For your reference, I am giving the script also. It was working fine previously but with the same procedure which I followed this script is not working and showing the above mentioned error.

Script from chimera import openModels, Molecule

out = open("sas111.txt", "a") x = '---------------------------------------------------------------------------------' for m in openModels.list(modelTypes=[Molecule]): for r in m.residues: try: sas = r.areaSAS except AttributeError: continue print>>out, r, sas print>>out,x out.close()

Kindly help me. Thank you. Aditya. _______________________________________________ Chimera-users mailing list Chimera-users@cgl.ucsf.edu http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users