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ExprVector.java
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199 lines (167 loc) · 3.89 KB
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package symjava.matrix;
import java.util.Iterator;
import java.util.Vector;
import symjava.numeric.NumVector;
import symjava.symbolic.Add;
import symjava.symbolic.Expr;
import symjava.symbolic.Symbols;
import symjava.symbolic.TypeInfo;
import symjava.symbolic.utils.AddList;
/**
* Vector of symbolic expressions
*
*
*/
public class ExprVector extends Expr implements Iterable<Expr> {
protected boolean isRow = true;
protected Vector<Expr> data = new Vector<Expr>();
public ExprVector() {
}
public ExprVector(int size) {
data.setSize(size);
}
public ExprVector(Expr[] array) {
for(Expr e : array)
data.add(e);
}
public ExprVector(Expr[] array, int startPos, int length) {
for(int i=startPos; i<startPos+length; i++)
data.add(array[i]);
}
public ExprVector(double[] array) {
for(double e : array)
data.add(Expr.valueOf(e));
}
public ExprVector(int[] array) {
for(int e : array)
data.add(Expr.valueOf(e));
}
public ExprVector(double[] array, int startPos, int length) {
for(int i=startPos; i<startPos+length; i++)
data.add(Expr.valueOf(array[i]));
}
public ExprVector(String prefix, int startIdx, int endIdx) {
Symbols v = new Symbols(prefix);
for(Expr e : v.get(startIdx, endIdx))
data.add(e);
}
public Expr get(int i) {
return data.get(i);
}
public void set(int i, Expr expr) {
if(i >= data.size())
data.setSize(i+1);
data.set(i, expr);
}
public void append(Expr e) {
data.add(e);
}
public int dim() {
return data.size();
}
public int length() {
return data.size();
}
public Expr[] getData() {
return data.toArray(new Expr[0]);
}
// \left[ {\begin{array}{c}
// 1\\
// 3\\
// \end{array} } \right]
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("vector(");
if(data.size() >= 1)
sb.append(data.get(0));
for(int j=1; j<data.size(); j++) {
sb.append(", " + data.get(j));
}
sb.append(")");
if(!isRow) sb.append("'");
return sb.toString();
}
public String toLatex() {
StringBuilder sb = new StringBuilder();
sb.append("\\left[ {\\begin{array}{c}");
for(int j=0; j<data.size(); j++) {
sb.append(data.get(j)+"\\\\\n");
}
sb.append("\\end{array} } \\right]");
if(isRow) sb.append("'");
return sb.toString();
}
@Override
public Iterator<Expr> iterator() {
return data.iterator();
}
public ExprVector subs(Expr from, Expr to) {
ExprVector rlt = new ExprVector();
for(Expr e : data) {
rlt.data.add(e.subs(from, to));
}
return rlt;
}
public ExprVector diff(Expr expr) {
ExprVector rlt = new ExprVector();
for(Expr e : data) {
rlt.data.add(e.diff(expr));
}
return rlt;
}
public NumVector toNumVector(Expr[] args) {
NumVector ret = new NumVector(this, args);
return ret;
}
public ExprVector trans() {
ExprVector rlt = new ExprVector(this.data.toArray(new Expr[0]));
rlt.isRow = !this.isRow;
return rlt;
}
public Expr add(Expr other) {
ExprVector o = (ExprVector)other;
ExprVector ret = new ExprVector();
for(int i=0; i<this.dim(); i++) {
ret.append(this.get(i).add(o.get(i)));
}
return ret;
}
public Expr dot(ExprVector other) {
AddList adds = new AddList();
for(int i=0; i<this.dim(); i++) {
adds.add(this.get(i).multiply(other.get(i)));
}
return adds.toExpr();
}
@Override
public Expr simplify() {
return null;
}
@Override
public boolean symEquals(Expr other) {
if(other instanceof ExprVector) {
ExprVector ov = (ExprVector)other;
if(this.dim() != ov.dim()) return false;
for(int i=0; i<this.dim(); i++) {
if(!this.get(i).symEquals(ov.get(i)))
return false;
}
return true;
}
return false;
}
@Override
public Expr[] args() {
// 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
}
}