Dear all, 

I would like to compute the number of CCCC gauche <--> trans transitions (per 
ns) for for several alkanes. I know that I can use g_angle with -ot flag. But 
in the manual it is stated that this command works only for dihedrals with 
multiplicity 3. 

In CHARMM36 force field, for example,  the CCCC dihedrals parameters have the 
following form:  

CTL2    CTL2    CTL2    CTL3    9       0.00    0.677808        2       ; New
CTL2    CTL2    CTL2    CTL3    9       180.00  0.196648        3       ; New
CTL2    CTL2    CTL2    CTL3    9       0.00    0.43932 4       ; New
CTL2    CTL2    CTL2    CTL3    9       0.00    0.740568        5       ; New
CTL2    CTL2    CTL2    CTL2    9       0.00    0.422584        2       ; New
CTL2    CTL2    CTL2    CTL2    9       180.00  0.594128        3       ; New
CTL2    CTL2    CTL2    CTL2    9       0.00    0.309616        4       ; New
CTL2    CTL2    CTL2    CTL2    9       0.00    0.405848        5       ; New

So it is possible to use the g_angle functionality with this force field ? 
Probably I can comment the lines where the angle multiplicity is not equal tp 3 
and regenerate a  tpr file and use it with g_angle, right ?  

Stephane 

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