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variable.h
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variable.h
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/* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
Copyright (2003) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the GNU General Public License.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
#ifndef LMP_VARIABLE_H
#define LMP_VARIABLE_H
#include "stdlib.h"
#include "pointers.h"
namespace LAMMPS_NS {
class Variable : protected Pointers {
public:
Variable(class LAMMPS *);
~Variable();
void set(int, char **);
void set(char *, int, char **);
int next(int, char **);
int find(char *);
int equalstyle(int);
int atomstyle(int);
char *retrieve(char *);
double compute_equal(int);
void compute_atom(int, int, double *, int, int);
int int_between_brackets(char *&);
double evaluate_boolean(char *);
unsigned int data_mask(int ivar);
unsigned int data_mask(char *str);
private:
int nvar; // # of defined variables
int maxvar; // max # of variables arrays can hold
char **names; // name of each variable
int *style; // style of each variable
int *num; // # of values for each variable
int *which; // next available value for each variable
int *pad; // 1 = pad loop/uloop variables with 0s, 0 = no pad
class VarReader **reader; // variable that reads lines from file
char ***data; // str value of each variable's values
int *eval_in_progress; // flag if evaluation of variable is in progress
class RanMars *randomequal; // random number generator for equal-style vars
class RanMars *randomatom; // random number generator for atom-style vars
int precedence[17]; // precedence level of math operators
// set length to include up to OR in enum
int me;
struct Tree { // parse tree for atom-style variables
double value;
double *array;
int *iarray;
int type;
int nstride;
int ivalue1,ivalue2;
Tree *left,*middle,*right;
};
void remove(int);
void grow();
void copy(int, char **, char **);
double evaluate(char *, Tree **);
double collapse_tree(Tree *);
double eval_tree(Tree *, int);
void free_tree(Tree *);
int find_matching_paren(char *, int, char *&);
int math_function(char *, char *, Tree **, Tree **, int &, double *, int &);
int group_function(char *, char *, Tree **, Tree **, int &, double *, int &);
int region_function(char *);
int special_function(char *, char *, Tree **, Tree **,
int &, double *, int &);
void peratom2global(int, char *, double *, int, int,
Tree **, Tree **, int &, double *, int &);
int is_atom_vector(char *);
void atom_vector(char *, Tree **, Tree **, int &);
int is_constant(char *);
double constant(char *);
double numeric(char *);
int inumeric(char *);
char *find_next_comma(char *);
void print_tree(Tree *, int);
};
class VarReader : protected Pointers {
public:
VarReader(class LAMMPS *, char *);
~VarReader();
int read(char *);
private:
int me;
FILE *fp;
};
}
#endif
/* ERROR/WARNING messages:
E: Illegal ... command
Self-explanatory. Check the input script syntax and compare to the
documentation for the command. You can use -echo screen as a
command-line option when running LAMMPS to see the offending line.
E: World variable count doesn't match # of partitions
A world-style variable must specify a number of values equal to the
number of processor partitions.
E: Universe/uloop variable count < # of partitions
A universe or uloop style variable must specify a number of values >= to the
number of processor partitions.
E: All universe/uloop variables must have same # of values
Self-explanatory.
E: Cannot redefine variable as a different style
An equal-style variable can be re-defined but only if it was
originally an equal-style variable.
E: Variable name must be alphanumeric or underscore characters
Self-explanatory.
E: Invalid variable in next command
Self-explanatory.
E: All variables in next command must be same style
Self-explanatory.
E: Invalid variable style with next command
Variable styles {equal} and {world} cannot be used in a next
command.
E: Invalid syntax in variable formula
Self-explanatory.
E: Variable evaluation before simulation box is defined
Cannot evaluate a compute or fix or atom-based value in a variable
before the simulation has been setup.
E: Invalid compute ID in variable formula
The compute is not recognized.
E: Compute used in variable between runs is not current
Computes cannot be invoked by a variable in between runs. Thus they
must have been evaluated on the last timestep of the previous run in
order for their value(s) to be accessed. See the doc page for the
variable command for more info.
E: Variable formula compute vector is accessed out-of-range
Self-explanatory.
E: Variable formula compute array is accessed out-of-range
Self-explanatory.
E: Per-atom compute in equal-style variable formula
Equal-style variables cannot use per-atom quantities.
E: Mismatched compute in variable formula
A compute is referenced incorrectly or a compute that produces per-atom
values is used in an equal-style variable formula.
E: Invalid fix ID in variable formula
The fix is not recognized.
E: Fix in variable not computed at compatible time
Fixes generate their values on specific timesteps. The variable is
requesting the values on a non-allowed timestep.
E: Variable formula fix vector is accessed out-of-range
Self-explanatory.
E: Variable formula fix array is accessed out-of-range
Self-explanatory.
E: Per-atom fix in equal-style variable formula
Equal-style variables cannot use per-atom quantities.
E: Mismatched fix in variable formula
A fix is referenced incorrectly or a fix that produces per-atom
values is used in an equal-style variable formula.
E: Invalid variable name in variable formula
Variable name is not recognized.
E: Invalid variable evaluation in variable formula
A variable used in a formula could not be evaluated.
E: Atom-style variable in equal-style variable formula
Atom-style variables generate one value per atom which is not allowed
in an equal-style variable.
E: Mismatched variable in variable formula
A variable is referenced incorrectly or an atom-style variable that
produces per-atom values is used in an equal-style variable
formula.
E: Invalid math/group/special function in variable formula
Self-explanatory.
E: Invalid thermo keyword in variable formula
The keyword is not recognized.
E: Divide by 0 in variable formula
Self-explanatory.
E: Power by 0 in variable formula
Self-explanatory.
E: Sqrt of negative value in variable formula
Self-explanatory.
E: Log of zero/negative value in variable formula
Self-explanatory.
E: Arcsin of invalid value in variable formula
Argument of arcsin() must be between -1 and 1.
E: Arccos of invalid value in variable formula
Argument of arccos() must be between -1 and 1.
E: Invalid math function in variable formula
Self-explanatory.
E: Non digit character between brackets in variable
Self-explantory.
E: Mismatched brackets in variable
Self-explanatory.
E: Empty brackets in variable
There is no variable syntax that uses empty brackets. Check
the variable doc page.
E: Index between variable brackets must be positive
Self-explanatory.
E: Cannot use ramp in variable formula between runs
This is because the ramp() function is time dependent.
E: Cannot use vdisplace in variable formula between runs
This is a function of elapsed time.
E: Cannot use swiggle in variable formula between runs
This is a function of elapsed time.
E: Cannot use cwiggle in variable formula between runs
This is a function of elapsed time.
E: Group ID in variable formula does not exist
Self-explanatory.
E: Invalid group function in variable formula
Group function is not recognized.
E: Region ID in variable formula does not exist
Self-explanatory.
E: Invalid special function in variable formula
Self-explanatory.
E: Gmask function in equal-style variable formula
Gmask is per-atom operation.
E: Rmask function in equal-style variable formula
Rmask is per-atom operation.
E: Grmask function in equal-style variable formula
Grmask is per-atom operation.
E: Indexed per-atom vector in variable formula without atom map
Accessing a value from an atom vector requires the ability to lookup
an atom index, which is provided by an atom map. An atom map does not
exist (by default) for non-molecular problems. Using the atom_modify
map command will force an atom map to be created.
E: Invalid atom vector in variable formula
The atom vector is not recognized.
E: Atom vector in equal-style variable formula
Atom vectors generate one value per atom which is not allowed
in an equal-style variable.
E: Expected floating point parameter in variable definition
The quantity being read is a non-numeric value.
E: Expected integer parameter in variable definition
The quantity being read is a floating point or non-numeric value.
E: Invalid Boolean syntax in if command
Self-explanatory.
*/

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