LOGSUMEXP
This is part of the landmarks module
It is only available if you configure PLUMED with ./configure –enable-modules=landmarks . Furthermore, this feature is still being developed so take care when using it and report any problems on the mailing list.

This action takes the exponential of a vector of logarithms and divides each element of the vector by the sum of the exponentials.

The log-exp-sum trick is used here

Examples
Glossary of keywords and components
Description of components
Quantity Description
.#!value the logarithms of the input weights logweights that are computed with the log-sum weights formula
Compulsory keywords
ARG the vector of logweights that you would like to normalise using the logsumexp trick