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Div.java
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102 lines (84 loc) · 1.96 KB
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package symjava.math;
import java.util.ArrayList;
import java.util.List;
import symjava.matrix.ExprVector;
import symjava.symbolic.Expr;
import symjava.symbolic.TypeInfo;
import symjava.symbolic.arity.NaryOp;
import symjava.symbolic.utils.Utils;
/**
* Divergence Operator
*
*/
public class Div extends NaryOp {
protected Expr expr;
public Div(ExprVector vec) {
super(null);
if(vec instanceof Grad) {
Grad g = (Grad)vec;
if(g.isAbstract()) {
this.args = g.getData();
this.label = "div(" +g+ ")";
this.sortKey = this.label;
return;
}
}
List<Expr> freeVars = Utils.extractSymbols(vec.getData());
create(vec, freeVars.toArray(new Expr[0]));
}
public Div(ExprVector vec, Expr... freeVars) {
super(null);
create(vec, freeVars);
}
private Div create(ExprVector vec, Expr... freeVars) {
if(vec.dim() != freeVars.length) {
throw new RuntimeException("vec.dim() != freeVars.length");
}
this.args = vec.getData();
List<Expr> list = new ArrayList<Expr>();
for(int i=0; i<this.args.length; i++) {
list.add(vec.get(i).diff(freeVars[i]));
}
this.expr = Utils.addListToExpr(list).simplify();
this.label = expr.getLabel();
this.sortKey = expr.getSortKey();
return this;
}
public static Div apply(ExprVector vec) {
return new Div(vec);
}
public static Div apply(ExprVector vec, Expr ...expr) {
return new Div(vec, expr);
}
@Override
public boolean isAbstract() {
return expr == null;
}
public Expr getExpr() {
return this.expr;
}
@Override
public Expr simplify() {
// TODO Auto-generated method stub
return null;
}
@Override
public boolean symEquals(Expr other) {
// TODO Auto-generated method stub
return false;
}
@Override
public Expr diff(Expr expr) {
// TODO Auto-generated method stub
return null;
}
@Override
public TypeInfo getTypeInfo() {
// TODO Auto-generated method stub
return null;
}
@Override
public void updateLabel() {
// TODO Auto-generated method stub
}
}