This is part of the generic module

Read quantities from a colvar file.

This Action can be used with driver to read in a colvar file that was generated during an MD simulation

Description of components

The READ command will read those fields that are labelled with the text string given to the VALUE keyword. It will also read in any fields that are labelleled with the text string given to the VALUE keyword followed by a dot and a further string. If a single Value is read in this value can be referenced using the label of the Action. Alternatively, if multiple quanties are read in, they can be referenced elsewhere in the input by using the label for the Action followed by a dot and the character string that appeared after the dot in the title of the field.

Compulsory keywords
STRIDE ( default=1 ) the frequency with which the file should be read.
EVERY ( default=1 ) only read every ith line of the colvar file. This should be used if the colvar was written more frequently than the trajectory.
VALUES the values to read from the file
FILE the name of the file from which to read these quantities
IGNORE_TIME ( default=off ) ignore the time in the colvar file. When this flag is not present read will be quite strict about the start time of the simulation and the stride between frames

( default=off ) use this flag if the forces added by any bias can be safely ignored. As an example forces can be safely ignored if you are doing postprocessing that does not involve outputting forces

UPDATE_FROM Only update this action from this time

Only update this action until this time


This input reads in data from a file called that was generated in a calculation that involved PLUMED. The first command reads in the data from the column headed phi1 while the second reads in the data from the column headed phi2.

rphi1:       READ  VALUES=phi1
rphi2:       READ  VALUES=phi2
PRINT ARG=rphi1,rphi2 STRIDE=500