2.10a breaks TORSION for angle on plane

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jamesm...@gmail.com

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Sep 15, 2025, 12:54:33 PM (11 days ago) Sep 15
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Dear all,

I have updated to plumed 2.10a to use EMMIVox with Gromacs-2021.5 and I am trying to use my old scripts from https://groups.google.com/g/plumed-users/c/GfMqob-aeLE/m/gna3EBmKAgAJ, but now I get the following error:

PLUMED: (core/Action.cpp:305) void PLMD::Action::error(const string&) const PLUMED: ERROR in input to action TORSION_SCALAR with label t : VECTOR1, VECTOR2 and AXIS should specify 2 atoms each  

This happens when using the script with plumed driver on a gro file with the metadynamics parts commented out.

Has something changed since 2.1.3 that may affect this? Or is using a gro file the problem? Another TORSION CV that is just a standard torsion based on some of these COM atoms works fine.

Many thanks
James

Gareth Tribello

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Sep 15, 2025, 1:23:15 PM (11 days ago) Sep 15
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Hi 

We had to make a change to the syntax of the TORSION command.  Now, instead of doing VECTOR1, VECTOR2 and AXIS, you use VECTORA, VECTORB and AXIS.  

You can find the revised documentation here:

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James Krieger

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Sep 15, 2025, 1:27:38 PM (11 days ago) Sep 15
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Thanks Gareth


Best wishes
James

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James Krieger

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Sep 15, 2025, 1:31:57 PM (11 days ago) Sep 15
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To clarify, I see that it has VECTORA and VECTORB down at bottom where the variables are defined, but the examples still contain VECTOR1 and VECTOR2

Best wishes
James
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