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Cos.java
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82 lines (70 loc) · 2.2 KB
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package symjava.symbolic;
import java.util.Map;
import symjava.symbolic.Expr.TYPE;
import symjava.symbolic.arity.UnaryOp;
import symjava.symbolic.utils.Utils;
import com.sun.org.apache.bcel.internal.Constants;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.InstructionFactory;
import com.sun.org.apache.bcel.internal.generic.InstructionHandle;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.MethodGen;
import com.sun.org.apache.bcel.internal.generic.ObjectType;
import com.sun.org.apache.bcel.internal.generic.Type;
public class Cos extends UnaryOp {
public Cos(Expr arg) {
super(arg);
updateLabel();
}
@Override
public Expr diff(Expr expr) {
return Negate.simplifiedIns(Sin.simplifiedIns(arg)).multiply(arg.diff(expr));
}
public static Expr simplifiedIns(Expr expr) {
return new Cos(expr);
}
@Override
public Expr simplify() {
return this;
}
@Override
public Expr subs(Expr from, Expr to) {
if(Utils.symCompare(this, from))
return to;
Expr sl = arg.subs(from, to);
if(sl == arg)
return this;
return new Cos(sl);
}
@Override
public boolean symEquals(Expr other) {
if(other instanceof Cos) {
Utils.symCompare(this.arg, ((Cos) other).arg);
}
return false;
}
@Override
public InstructionHandle bytecodeGen(String clsName, MethodGen mg,
ConstantPoolGen cp, InstructionFactory factory,
InstructionList il, Map<String, Integer> argsMap, int argsStartPos,
Map<Expr, Integer> funcRefsMap) {
InstructionHandle startPos = arg.bytecodeGen(clsName, mg, cp, factory, il, argsMap, argsStartPos, funcRefsMap);
if(arg.getType() == TYPE.MATRIX || arg.getType() == TYPE.VECTOR) {
il.append(factory.createInvoke("symjava.symbolic.utils.BytecodeOpSupport", "cos",
new ObjectType("Jama.Matrix"),
new Type[] { new ObjectType("Jama.Matrix") },
Constants.INVOKESTATIC));
} else {
il.append(factory.createInvoke("java.lang.Math", "cos",
Type.DOUBLE,
new Type[] { Type.DOUBLE },
Constants.INVOKESTATIC));
}
return startPos;
}
@Override
public void updateLabel() {
label = "cos(" + arg + ")";
sortKey = label;
}
}