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1 package JSci.maths.symbolic;
2
3 import JSci.maths.*;
4 import JSci.maths.fields.*;
5 import JSci.maths.groups.*;
6
7 import java.util.*;
8
9 class Negative extends Expression {
10
11 private final Expression arg;
12
13 public Negative(Expression arg) {
14 this.arg=arg;
15 }
16
17 public String  toString() {
18 String r = "-";
19 if (arg.getPriority()<getPriority()) r+="("+arg+")";
20 else r+=""+arg;
21 return r;
22 }
23
24 public Expression differentiate(Variable x) {
25 return new Negative(arg.differentiate(x));
26 }
27
28 public Expression evaluate() {
29 Expression a = arg.evaluate();
30 if (a instanceof Constant) {
31 AbelianGroup.Member p = (AbelianGroup.Member)((Constant)a).getValue();
32 return new Constant(p.negate());
33 }
34 return new Negative(a);
35 }
36
37 protected int getPriority() {return -1;}
38
39 public Object getSet() { return arg.getSet(); }
40
41 }
42
43
44
45 |
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