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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@322 f3b2605a-c512-4ea7-a41b-209d697bcdaa

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This commit is contained in:
sjplimp
2007-02-21 00:15:29 +00:00
parent e85be07e18
commit 64b10074dc
14 changed files with 455 additions and 202 deletions
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427
src/variable.cpp
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@ -33,7 +33,8 @@ using namespace LAMMPS_NS;
#define VARDELTA 4
enum{INDEX,LOOP,EQUAL,WORLD,UNIVERSE,ULOOP};
enum{INDEX,LOOP,EQUAL,WORLD,UNIVERSE,ULOOP,ATOM};
enum{VALUE,ATOMARRAY,TYPEARRAY,ADD,SUB,MULT,DIV,NEG,POW,EXP,LN,SQRT};
/* ---------------------------------------------------------------------- */
@ -73,9 +74,9 @@ void Variable::set(int narg, char **arg)
{
if (narg < 3) error->all("Illegal variable command");
// if var already exists, just skip (except EQUAL vars)
// if var already exists, just skip
if (find(arg[0]) >= 0 && strcmp(arg[1],"equal") != 0) return;
if (find(arg[0]) >= 0) return;
// make space for new variable
@ -90,6 +91,11 @@ void Variable::set(int narg, char **arg)
memory->srealloc(data,maxvar*sizeof(char **),"var:data");
}
// set name of variable
names[nvar] = new char[strlen(arg[0]) + 1];
strcpy(names[nvar],arg[0]);
// INDEX
// num = listed args, index = 1st value, data = copied args
@ -111,16 +117,10 @@ void Variable::set(int narg, char **arg)
for (int i = 0; i < num[nvar]; i++) data[nvar][i] = NULL;
// EQUAL
// remove pre-existing var if also style EQUAL (allows it to be reset)
// num = 2, index = 1st value
// data = 2 values, 1st is string to eval, 2nd is filled on retrieval
} else if (strcmp(arg[1],"equal") == 0) {
if (find(arg[0]) >= 0) {
if (style[find(arg[0])] != EQUAL)
error->all("Cannot redefine variable as a different style");
remove(find(arg[0]));
}
style[nvar] = EQUAL;
num[nvar] = 2;
index[nvar] = 0;
@ -187,17 +187,24 @@ void Variable::set(int narg, char **arg)
arg[0],index[nvar]+1,universe->iworld);
}
// ATOM
// num = 1, index = 1st value
// data = 1 value, string to eval
} else if (strcmp(arg[1],"atom") == 0) {
style[nvar] = ATOM;
num[nvar] = 1;
index[nvar] = 0;
data[nvar] = new char*[num[nvar]];
copy(1,&arg[2],data[nvar]);
} else error->all("Illegal variable command");
// set variable name (after possible EQUAL remove)
names[nvar] = new char[strlen(arg[0]) + 1];
strcpy(names[nvar],arg[0]);
nvar++;
}
/* ----------------------------------------------------------------------
single-value INDEX variable created by command-line argument
single-value EQUAL variable created by command-line argument
------------------------------------------------------------------------- */
void Variable::set(char *name, char *value)
@ -205,25 +212,12 @@ void Variable::set(char *name, char *value)
int ivar = find(name);
if (ivar >= 0) error->all("Command-line variable already exists");
if (nvar == maxvar) {
maxvar += VARDELTA;
names = (char **)
memory->srealloc(names,maxvar*sizeof(char *),"var:names");
style = (int *) memory->srealloc(style,maxvar*sizeof(int),"var:style");
num = (int *) memory->srealloc(num,maxvar*sizeof(int),"var:num");
index = (int *) memory->srealloc(index,maxvar*sizeof(int),"var:index");
data = (char ***)
memory->srealloc(data,maxvar*sizeof(char **),"var:data");
}
names[nvar] = new char[strlen(name) + 1];
strcpy(names[nvar],name);
style[nvar] = INDEX;
num[nvar] = 1;
index[nvar] = 0;
data[nvar] = new char*[num[nvar]];
copy(1,&value,data[nvar]);
nvar++;
char **newarg = new char*[3];
newarg[0] = name;
newarg[1] = "equal";
newarg[2] = value;
set(3,newarg);
delete [] newarg;
}
/* ----------------------------------------------------------------------
@ -247,10 +241,10 @@ int Variable::next(int narg, char **arg)
error->all("All variables in next command must be same style");
}
// check for invalid styles EQUAL or WORLD
// invalid styles EQUAL or WORLD or ATOM
int istyle = style[find(arg[0])];
if (istyle == EQUAL || istyle == WORLD)
if (istyle == EQUAL || istyle == WORLD || istyle == ATOM)
error->all("Invalid variable style with next command");
// increment all variables in list
@ -336,14 +330,16 @@ char *Variable::retrieve(char *name)
delete [] value;
str = data[ivar][0];
} else if (style[ivar] == EQUAL) {
char *value = evaluate(data[ivar][0]);
int n = strlen(value) + 1;
char result[32];
double answer = evaluate(data[ivar][0],NULL);
sprintf(result,"%.10g",answer);
int n = strlen(result) + 1;
if (data[ivar][1]) delete [] data[ivar][1];
data[ivar][1] = new char[n];
strcpy(data[ivar][1],value);
delete [] value;
strcpy(data[ivar][1],result);
str = data[ivar][1];
}
} else if (style[ivar] == ATOM) return NULL;
return str;
}
@ -404,34 +400,34 @@ void Variable::copy(int narg, char **from, char **to)
group function = mass(group), xcm(group,x), ...
atom vector = x[123], y[3], vx[34], ...
compute vector = c_mytemp[0], c_thermo_press[3], ...
numbers start with a digit or "." or "-" (no parens or brackets)
keywords start with a lowercase letter (no parens or brackets)
functions contain ()
can have 1 or 2 args, each of which can be a "string"
vectors contain []
single arg must be integer
for atom vectors, it is global ID of atom
for atom vectors, arg is global ID of atom
for compute vectors, 0 is the scalar value, 1-N are vector values
keywords start with a lowercase letter (no parens or brackets)
numbers start with a digit or "." or "-" (no parens or brackets)
see lists of valid functions, vectors, keywords below
when string is evaluated, put result in a newly allocated string
return the address of result string (will be freed by caller)
see lists of valid functions & vectors below
return answer = value of string
------------------------------------------------------------------------- */
char *Variable::evaluate(char *str)
double Variable::evaluate(char *str, Tree *tree)
{
// allocate a new string for the eventual result
char *result = new char[32];
double answer;
double answer = 0.0;
if (tree) {
tree->type = VALUE;
tree->left = tree->right = NULL;
}
// string is a "function" since contains ()
// grab one or two args, separated by ","
// evaulate args recursively
// then evaluate math or group function
// if tree = NULL, evaluate math or group function
// else store as leaf in tree
if (strchr(str,'(')) {
if (str[strlen(str)-1] != ')')
error->all("Cannot evaluate variable equal command");
if (str[strlen(str)-1] != ')') error->all("Cannot evaluate variable");
char *ptr = strchr(str,'(');
int n = ptr - str;
@ -442,8 +438,7 @@ char *Variable::evaluate(char *str)
char *comma = ++ptr;
int level = 0;
while (1) {
if (*comma == '\0')
error->all("Cannot evaluate variable equal command");
if (*comma == '\0') error->all("Cannot evaluate variable");
else if (*comma == ',' && level == 0) break;
else if (*comma == ')' && level == 0) break;
else if (*comma == '(') level++;
@ -467,106 +462,132 @@ char *Variable::evaluate(char *str)
} else arg2 = NULL;
double value1,value2;
char *strarg1 = NULL;
char *strarg2 = NULL;
// customize by adding math function to this list and to if statement
// add(x,y),sub(x,y),mult(x,y),div(x,y),neg(x),
// pow(x,y),exp(x),ln(x),sqrt(x)
if (strcmp(func,"add") == 0) {
if (!arg2) error->all("Cannot evaluate variable equal command");
strarg1 = evaluate(arg1);
strarg2 = evaluate(arg2);
value1 = atof(strarg1);
value2 = atof(strarg2);
answer = value1 + value2;
if (!arg2) error->all("Cannot evaluate variable");
if (tree) {
tree->type = ADD;
tree->left = new Tree();
tree->right = new Tree();
value1 = evaluate(arg1,tree->left);
value2 = evaluate(arg2,tree->right);
} else answer = evaluate(arg1,NULL) + evaluate(arg2,NULL);
} else if (strcmp(func,"sub") == 0) {
if (!arg2) error->all("Cannot evaluate variable equal command");
strarg1 = evaluate(arg1);
strarg2 = evaluate(arg2);
value1 = atof(strarg1);
value2 = atof(strarg2);
answer = value1 - value2;
if (!arg2) error->all("Cannot evaluate variable");
if (tree) {
tree->type = SUB;
tree->left = new Tree();
tree->right = new Tree();
value1 = evaluate(arg1,tree->left);
value2 = evaluate(arg2,tree->right);
} else answer = evaluate(arg1,NULL) - evaluate(arg2,NULL);
} else if (strcmp(func,"mult") == 0) {
if (!arg2) error->all("Cannot evaluate variable equal command");
strarg1 = evaluate(arg1);
strarg2 = evaluate(arg2);
value1 = atof(strarg1);
value2 = atof(strarg2);
answer = value1 * value2;
if (!arg2) error->all("Cannot evaluate variable");
if (tree) {
tree->type = MULT;
tree->left = new Tree();
tree->right = new Tree();
value1 = evaluate(arg1,tree->left);
value2 = evaluate(arg2,tree->right);
} else answer = evaluate(arg1,NULL) * evaluate(arg2,NULL);
} else if (strcmp(func,"div") == 0) {
if (!arg2) error->all("Cannot evaluate variable equal command");
strarg1 = evaluate(arg1);
strarg2 = evaluate(arg2);
value1 = atof(strarg1);
value2 = atof(strarg2);
if (value2 == 0.0)
error->all("Cannot evaluate variable equal command");
answer = value1 / value2;
if (!arg2) error->all("Cannot evaluate variable");
if (tree) {
tree->type = DIV;
tree->left = new Tree();
tree->right = new Tree();
value1 = evaluate(arg1,tree->left);
value2 = evaluate(arg2,tree->right);
} else {
value1 = evaluate(arg1,NULL);
value2 = evaluate(arg2,NULL);
if (value2 == 0.0) error->all("Cannot evaluate variable");
answer = value1 / value2;
}
} else if (strcmp(func,"neg") == 0) {
if (arg2) error->all("Cannot evaluate variable equal command");
strarg1 = evaluate(arg1);
value1 = atof(strarg1);
answer = -value1;
if (arg2) error->all("Cannot evaluate variable");
if (tree) {
tree->type = NEG;
tree->left = new Tree();
value1 = evaluate(arg1,tree->left);
} else answer = -evaluate(arg1,NULL);
} else if (strcmp(func,"pow") == 0) {
if (!arg2) error->all("Cannot evaluate variable equal command");
strarg1 = evaluate(arg1);
strarg2 = evaluate(arg2);
value1 = atof(strarg1);
value2 = atof(strarg2);
if (value2 == 0.0)
error->all("Cannot evaluate variable equal command");
answer = pow(value1,value2);
if (!arg2) error->all("Cannot evaluate variable");
if (tree) {
tree->type = POW;
tree->left = new Tree();
tree->right = new Tree();
value1 = evaluate(arg1,tree->left);
value2 = evaluate(arg2,tree->right);
} else {
value1 = evaluate(arg1,NULL);
value2 = evaluate(arg2,NULL);
if (value2 == 0.0) error->all("Cannot evaluate variable");
answer = pow(value1,value2);
}
} else if (strcmp(func,"exp") == 0) {
if (arg2) error->all("Cannot evaluate variable equal command");
strarg1 = evaluate(arg1);
value1 = atof(strarg1);
answer = exp(value1);
if (arg2) error->all("Cannot evaluate variable");
if (tree) {
tree->type = EXP;
tree->left = new Tree();
value1 = evaluate(arg1,tree->left);
} else answer = exp(evaluate(arg1,NULL));
} else if (strcmp(func,"ln") == 0) {
if (arg2) error->all("Cannot evaluate variable equal command");
strarg1 = evaluate(arg1);
value1 = atof(strarg1);
if (value1 == 0.0)
error->all("Cannot evaluate variable equal command");
answer = log(value1);
if (arg2) error->all("Cannot evaluate variable");
if (tree) {
tree->type = LN;
tree->left = new Tree();
value1 = evaluate(arg1,tree->left);
} else {
value1 = evaluate(arg1,NULL);
if (value1 == 0.0) error->all("Cannot evaluate variable");
answer = log(value1);
}
} else if (strcmp(func,"sqrt") == 0) {
if (arg2) error->all("Cannot evaluate variable equal command");
strarg1 = evaluate(arg1);
value1 = atof(strarg1);
if (value1 == 0.0)
error->all("Cannot evaluate variable equal command");
answer = sqrt(value1);
if (arg2) error->all("Cannot evaluate variable");
if (tree) {
tree->type = SQRT;
tree->left = new Tree();
value1 = evaluate(arg1,tree->left);
} else {
value1 = evaluate(arg1,NULL);
if (value1 == 0.0) error->all("Cannot evaluate variable");
answer = sqrt(value1);
}
// customize by adding group function to this list and to if statement
// mass(group),charge(group),xcm(group,dim),vcm(group,dim),
// bound(group,xmin),gyration(group)
} else if (strcmp(func,"mass") == 0) {
if (arg2) error->all("Cannot evaluate variable equal command");
if (arg2) error->all("Cannot evaluate variable");
int igroup = group->find(arg1);
if (igroup == -1) error->all("Variable equal group ID does not exist");
if (igroup == -1) error->all("Variable group ID does not exist");
atom->check_mass();
answer = group->mass(igroup);
} else if (strcmp(func,"charge") == 0) {
if (arg2) error->all("Cannot evaluate variable equal command");
if (arg2) error->all("Cannot evaluate variable");
int igroup = group->find(arg1);
if (igroup == -1) error->all("Variable equal group ID does not exist");
if (igroup == -1) error->all("Variable group ID does not exist");
answer = group->charge(igroup);
} else if (strcmp(func,"xcm") == 0) {
if (!arg2) error->all("Cannot evaluate variable equal command");
if (!arg2) error->all("Cannot evaluate variable");
int igroup = group->find(arg1);
if (igroup == -1) error->all("Variable equal group ID does not exist");
if (igroup == -1) error->all("Variable group ID does not exist");
atom->check_mass();
double masstotal = group->mass(igroup);
double xcm[3];
@ -574,12 +595,12 @@ char *Variable::evaluate(char *str)
if (strcmp(arg2,"x") == 0) answer = xcm[0];
else if (strcmp(arg2,"y") == 0) answer = xcm[1];
else if (strcmp(arg2,"z") == 0) answer = xcm[2];
else error->all("Cannot evaluate variable equal command");
else error->all("Cannot evaluate variable");
} else if (strcmp(func,"vcm") == 0) {
if (!arg2) error->all("Cannot evaluate variable equal command");
if (!arg2) error->all("Cannot evaluate variable");
int igroup = group->find(arg1);
if (igroup == -1) error->all("Variable equal group ID does not exist");
if (igroup == -1) error->all("Variable group ID does not exist");
atom->check_mass();
double masstotal = group->mass(igroup);
double vcm[3];
@ -587,12 +608,12 @@ char *Variable::evaluate(char *str)
if (strcmp(arg2,"x") == 0) answer = vcm[0];
else if (strcmp(arg2,"y") == 0) answer = vcm[1];
else if (strcmp(arg2,"z") == 0) answer = vcm[2];
else error->all("Cannot evaluate variable equal command");
else error->all("Cannot evaluate variable");
} else if (strcmp(func,"bound") == 0) {
if (!arg2) error->all("Cannot evaluate variable equal command");
if (!arg2) error->all("Cannot evaluate variable");
int igroup = group->find(arg1);
if (igroup == -1) error->all("Variable equal group ID does not exist");
if (igroup == -1) error->all("Variable group ID does not exist");
double minmax[6];
group->bounds(igroup,minmax);
if (strcmp(arg2,"xmin") == 0) answer = minmax[0];
@ -601,28 +622,23 @@ char *Variable::evaluate(char *str)
else if (strcmp(arg2,"ymax") == 0) answer = minmax[3];
else if (strcmp(arg2,"zmin") == 0) answer = minmax[4];
else if (strcmp(arg2,"zmax") == 0) answer = minmax[5];
else error->all("Cannot evaluate variable equal command");
else error->all("Cannot evaluate variable");
} else if (strcmp(func,"gyration") == 0) {
if (!arg2) error->all("Cannot evaluate variable equal command");
if (!arg2) error->all("Cannot evaluate variable");
int igroup = group->find(arg1);
if (igroup == -1) error->all("Variable equal group ID does not exist");
if (igroup == -1) error->all("Variable group ID does not exist");
atom->check_mass();
double masstotal = group->mass(igroup);
double xcm[3];
group->xcm(igroup,masstotal,xcm);
answer = group->gyration(igroup,masstotal,xcm);
} else error->all("Invalid math/group function in variable equal command");
} else error->all("Invalid math/group function in variable");
delete [] func;
delete [] arg1;
delete [] strarg1;
if (arg2) {
delete [] arg2;
delete [] strarg2;
}
sprintf(result,"%.10g",answer);
delete [] arg2;
// string is a "vector" since contains []
// index = everything between [] evaluated as integer
@ -633,8 +649,7 @@ char *Variable::evaluate(char *str)
// grab atom-based value with index as global atom ID
} else if (strchr(str,'[')) {
if (str[strlen(str)-1] != ']')
error->all("Cannot evaluate variable equal command");
if (str[strlen(str)-1] != ']') error->all("Cannot evaluate variable");
char *ptr = strchr(str,'[');
int n = ptr - str;
@ -659,7 +674,7 @@ char *Variable::evaluate(char *str)
for (icompute = 0; icompute < modify->ncompute; icompute++)
if (strcmp(id,modify->compute[icompute]->id) == 0) break;
if (icompute == modify->ncompute)
error->all("Invalid compute ID in variable equal");
error->all("Invalid compute ID in variable");
delete [] id;
modify->compute[icompute]->init();
@ -672,7 +687,7 @@ char *Variable::evaluate(char *str)
error->all("Variable compute ID does not compute scalar info");
if (modify->compute[icompute]->id_pre) {
int ipre = modify->find_compute(modify->compute[icompute]->id_pre);
if (ipre < 0) error->all("Could not pre-compute in variable equal");
if (ipre < 0) error->all("Could not pre-compute in variable");
answer = modify->compute[ipre]->compute_scalar();
}
answer = modify->compute[icompute]->compute_scalar();
@ -683,28 +698,62 @@ char *Variable::evaluate(char *str)
error->all("Variable compute ID vector is not large enough");
if (modify->compute[icompute]->id_pre) {
int ipre = modify->find_compute(modify->compute[icompute]->id_pre);
if (ipre < 0) error->all("Could not pre-compute in variable equal");
if (ipre < 0) error->all("Could not pre-compute in variable");
modify->compute[ipre]->compute_vector();
}
modify->compute[icompute]->compute_vector();
answer = modify->compute[icompute]->vector[index-1];
} else error->all("Invalid compute ID index in variable equal");
} else error->all("Invalid compute ID index in variable");
} else if (tree) {
if (strlen(arg)) error->all("Invalid atom vector argument in variable");
// customize by adding atom vector to this list and to if statement
// mass,x,y,z,vx,vy,vz,fx,fy,fz
tree->type = ATOMARRAY;
tree->nstride = 3;
if (strcmp(vector,"mass") == 0) {
if (atom->mass) {
tree->type = TYPEARRAY;
tree->array = atom->mass;
} else {
tree->nstride = 1;
tree->array = atom->rmass;
}
}
else if (strcmp(vector,"x") == 0) tree->array = &atom->x[0][0];
else if (strcmp(vector,"y") == 0) tree->array = &atom->x[0][1];
else if (strcmp(vector,"z") == 0) tree->array = &atom->x[0][2];
else if (strcmp(vector,"vx") == 0) tree->array = &atom->v[0][0];
else if (strcmp(vector,"vy") == 0) tree->array = &atom->v[0][1];
else if (strcmp(vector,"vz") == 0) tree->array = &atom->v[0][2];
else if (strcmp(vector,"fx") == 0) tree->array = &atom->f[0][0];
else if (strcmp(vector,"fy") == 0) tree->array = &atom->f[0][1];
else if (strcmp(vector,"fz") == 0) tree->array = &atom->f[0][2];
else error->all("Invalid atom vector in variable");
} else {
if (atom->map_style == 0)
error->all("Cannot use atom vectors in variable "
"unless atom map exists");
error->all("Cannot use atom vector in variable unless atom map exists");
int index = atom->map(atoi(arg));
// customize by adding atom vector to this list and to if statement
// x,y,z,vx,vy,vz,fx,fy,fz
// mass,x,y,z,vx,vy,vz,fx,fy,fz
double mine;
if (index >= 0 && index < atom->nlocal) {
if (strcmp(vector,"x") == 0) mine = atom->x[index][0];
if (strcmp(vector,"mass") == 0) {
if (atom->mass) mine = atom->mass[atom->type[index]];
else mine = atom->rmass[index];
}
else if (strcmp(vector,"x") == 0) mine = atom->x[index][0];
else if (strcmp(vector,"y") == 0) mine = atom->x[index][1];
else if (strcmp(vector,"z") == 0) mine = atom->x[index][2];
else if (strcmp(vector,"vx") == 0) mine = atom->v[index][0];
@ -714,7 +763,7 @@ char *Variable::evaluate(char *str)
else if (strcmp(vector,"fy") == 0) mine = atom->f[index][1];
else if (strcmp(vector,"fz") == 0) mine = atom->f[index][2];
else error->one("Invalid atom vector in variable equal command");
else error->one("Invalid atom vector in variable");
} else mine = 0.0;
@ -723,7 +772,6 @@ char *Variable::evaluate(char *str)
delete [] vector;
delete [] arg;
sprintf(result,"%.10g",answer);
// string is "keyword" since starts with lowercase letter
// if keyword starts with "v_", trailing chars are variable name
@ -731,8 +779,6 @@ char *Variable::evaluate(char *str)
// else is thermo keyword
// evaluate it via evaluate_keyword()
// compute appropriate value via thermo
} else if (islower(str[0])) {
if (strncmp(str,"v_",2) == 0) {
@ -741,31 +787,98 @@ char *Variable::evaluate(char *str)
strcpy(id,&str[2]);
char *v = retrieve(id);
if (v == NULL)
error->all("Invalid variable name in variable equal command");
if (v == NULL) error->all("Invalid variable name in variable");
delete [] id;
answer = atof(v);
} else {
int flag = output->thermo->evaluate_keyword(str,&answer);
if (flag) error->all("Invalid thermo keyword in variable equal command");
if (flag) error->all("Invalid thermo keyword in variable");
}
sprintf(result,"%.10g",answer);
// string is a number since starts with digit or "." or "-"
// just copy to result
} else if (isdigit(str[0]) || str[0] == '.' || str[0] == '-') {
strcpy(result,str);
answer = atof(str);
// string is an error
} else error->all("Cannot evaluate variable equal command");
} else error->all("Cannot evaluate variable");
// return newly allocated string
// store answer in tree and return it
return result;
if (tree) tree->value = answer;
return answer;
}
/* ---------------------------------------------------------------------- */
void Variable::build_parse_tree(int ivar)
{
if (style[ivar] != ATOM) error->all("");
ptree = new Tree();
double tmp = evaluate(data[ivar][0],ptree);
}
/* ---------------------------------------------------------------------- */
void Variable::evaluate_parse_tree(int igroup, double *result)
{
int groupbit = group->bitmask[igroup];
int *mask = atom->mask;
int nlocal = atom->nlocal;
for (int i = 0; i < nlocal; i++) {
if (mask[i] && groupbit) result[i] = eval_tree(ptree,i);
else result[i] = 0.0;
}
}
/* ---------------------------------------------------------------------- */
void Variable::free_parse_tree()
{
free_tree(ptree);
}
/* ---------------------------------------------------------------------- */
double Variable::eval_tree(Tree *tree, int i)
{
if (tree->type == VALUE) return tree->value;
if (tree->type == ATOMARRAY) return tree->array[i*tree->nstride];
if (tree->type == TYPEARRAY) return tree->array[atom->type[i]];
if (tree->type == ADD)
return eval_tree(tree->left,i) + eval_tree(tree->right,i);
if (tree->type == SUB)
return eval_tree(tree->left,i) - eval_tree(tree->right,i);
if (tree->type == MULT)
return eval_tree(tree->left,i) * eval_tree(tree->right,i);
if (tree->type == DIV)
return eval_tree(tree->left,i) / eval_tree(tree->right,i);
if (tree->type == NEG)
return -eval_tree(tree->left,i);
if (tree->type == POW)
return pow(eval_tree(tree->left,i),eval_tree(tree->right,i));
if (tree->type == EXP)
return exp(eval_tree(tree->left,i));
if (tree->type == LN)
return log(eval_tree(tree->left,i));
if (tree->type == SQRT)
return sqrt(eval_tree(tree->left,i));
return 0.0;
}
/* ---------------------------------------------------------------------- */
void Variable::free_tree(Tree *tree)
{
if (tree->left) free_tree(tree->left);
if (tree->right) free_tree(tree->right);
delete tree;
}