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General discussions (Q&As) / local helical axis
« on: April 19, 2012, 12:23:34 pm »
I am building a uniform helix with repeating values of step parameters. In this way, the local helical axis is the same for every step. I want to put the local helical axis in  at the center and perpendicular to the bottom of my figure. Where can I find the vectors of the local helical axis? Are they contained in the ref_frames.dat generated by the 'rebuild' command?

Thanks a lot!


General discussions (Q&As) / 3DNA on 64 bit Linux (Ubuntu)
« on: September 09, 2011, 04:52:36 pm »
I have to work at 64 bit Linux (Ubuntu) system. Now I can't run X3DNA (32 bit Linux version) at 64 bit Linux system.
Do we have any solution to avoid this problem or we need to compile 3DNA at 64 bit Linux (Ubuntu)?
Thanks a lot!


General discussions (Q&As) / 3DNA setup at Linux
« on: August 19, 2011, 04:06:23 pm »
HI! Xiangjun:
I downloaded and unzipped 3DNA in Linux version. I went to /X3DNA/bin/ and run x3dna_setup, it gave me error message

feixu@homestar:~/X3DNA/bin$ x3dna_setup
x3dna_setup: command not found

I checked the mode of the directories. They are executable.
feixu@homestar:~/X3DNA$ ls -l
total 24
drwx------  2 feixu feixu 4096 2008-08-06 18:56 bin
drwx------  5 feixu feixu 4096 2008-08-06 18:56 config
drwx------  2 feixu feixu 4096 2008-10-14 01:39 doc
drwx------  7 feixu feixu 4096 2008-08-06 18:20 examples
drwx------ 58 feixu feixu 4096 2008-08-06 18:20 fiber
drwx------  9 feixu feixu 4096 2008-08-06 18:20 NP_Recipes

And the OS system is UBUNTU 11.04

Could you please think of the solution?

Thanks a lot!


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Created and maintained by Dr. Xiang-Jun Lu [律祥俊] (
The Bussemaker Laboratory at the Department of Biological Sciences, Columbia University.