CONSTANT

This is part of the generic module

Create a constant value that can be passed to actions

Useful in combination with functions that takes in input constants or parameters.

Examples

The following input instructs plumed to compute the distance between atoms 1 and 2. If this distance is between 1.0 and 2.0, it is printed. If it is lower than 1.0 (larger than 2.0), 1.0 (2.0) is printed

Click on the labels of the actions for more information on what each action computes

cn: CONSTANT 
VALUES
the numbers that are in your constant value 
=1.0,2.0  You cannot view the components that are calculated by each action for this input file. Sorry 
dis: DISTANCE 
ATOMS
the pair of atom that we are calculating the distance between. 
=1,2  You cannot view the components that are calculated by each action for this input file. Sorry 
sss: SORT 
ARG
the input to this function. 
=cn.v-0,dis,cn.v-1  You cannot view the components that are calculated by each action for this input file. Sorry 
PRINT 
ARG
the input for this action is the scalar output from one or more other actions. 
=sss.2  You cannot view the components that are calculated by each action for this input file. Sorry 

In case you want to pass a single value you can use VALUE:

Click on the labels of the actions for more information on what each action computes

contract shortcuts

cn: CONSTANT 
VALUE
the single number that you would like to store 
=1.0 The CONSTANT action with label cn calculates a single scalar value
dis: DISTANCE 
ATOMS
the pair of atom that we are calculating the distance between. 
=1,2 The DISTANCE action with label dis calculates a single scalar value
sss: SORT 
ARG
the input to this function. 
=cn,dis The SORT action with label sss calculates the following quantities:

 Quantity   
 Description  
sss.1
the label of this action is set by user in the input. See documentation above.
sss.2
the label of this action is set by user in the input. See documentation above.


PRINT 
ARG
the input for this action is the scalar output from one or more other actions. 
=sss.1 The PRINT action with label 

cn: CONSTANT 
VALUE
the single number that you would like to store 
=1.0 The CONSTANT action with label cn calculates a single scalar value
dis: DISTANCE 
ATOMS
the pair of atom that we are calculating the distance between. 
=1,2 The DISTANCE action with label dis calculates a single scalar value
sss: SORT_SCALAR 
ARG
the input for this action is the scalar output from one or more other actions. 
=cn,dis The SORT_SCALAR action with label sss calculates the following quantities:

 Quantity   
 Description  
sss.1
the label of this action is set by user in the input. See documentation above.
sss.2
the label of this action is set by user in the input. See documentation above.


PRINT 
ARG
the input for this action is the scalar output from one or more other actions. 
=sss.1 The PRINT action with label 

Glossary of keywords and components

Description of components

By default the value of the calculated quantity can be referenced elsewhere in the input file by using the label of the action. Alternatively this Action can be used to calculate the following quantities by employing the keywords listed below. These quantities can be referenced elsewhere in the input by using this Action's label followed by a dot and the name of the quantity required from the list below.

Quantity	Keyword	Description
v	SCALARS	the # value

Compulsory keywords

NROWS	( default=0 ) the number of rows in your input matrix
NCOLS	( default=0 ) the number of columns in your matrix

Options

SCALARS	( default=off ) treat the input list of numbers as a set of scalars
NOLOG	( default=off ) do not report all the read in scalars in the log
FILE	an input file containing the matrix
VALUE	the single number that you would like to store
VALUES	the numbers that are in your constant value