## Bug #53

### Angle definitions maybe wrong in g_chi

**Description**

David,

I saw the discussion about the omega angle calculated by by the g_chi

program and you pointed out that the omega definition is wrong in 3.3. I

think the phi and psi angles are wrongly definied as well. Compare the

angles given by g_rama and by g_chi -rama. In the result given by the

latter program the phi psi are also wrong.

bye,

Sandor Lovas (from the mailing list)

### History

#### #1 Updated by Erik Lindahl almost 15 years ago

Fixed angle definitions in g_chi, so that Phi/Psi angles are defined

correctly whenever possible instead of using faked angles involving O.

(This is still done for the first and last residues). The phase is now

also correct for Omega dihedrals, and ramachandran values should agree

with those from g_rama.