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
compulsory keyword 
the values 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
compulsory keyword 
the labels of the values that you would like to print to the file 
=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
compulsory keyword 
the values input to this function 
=cn,dis The SORT action with label sss calculates the following quantities:

 Quantity   
 Description  
sss.1
the 1th largest of the input scalars
sss.2
the 2th largest of the input scalars


PRINT 
ARG
compulsory keyword 
the labels of the values that you would like to print to the file 
=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
PRINT 
ARG
compulsory keyword 
the labels of the values that you would like to print to the file 
=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   
 Description    

 .#!value  
the constant value that was read from the plumed input   

In addition the following quantities can be calculated by employing the keywords listed 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