question about bonds

Dear all,

I have implemented a variant of the harmonic bond that is anisotropic, with different equilibrium distances in the three different directions. Now I want to vary the equilibrium distance in space. I have tried to define different groups with different lengths but gives me the error:

ERROR: All bond coeffs are not set

I’m not sure what’s the best way to go.


please keep in mind that reposting the same question multiple times in
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also consider that on christmas, people tend to be a bit occupied with
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