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SymVector.java
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111 lines (90 loc) · 2.12 KB
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package symjava.matrix;
import java.util.Iterator;
import java.util.Vector;
import symjava.numeric.NumVector;
import symjava.symbolic.Expr;
import symjava.symbolic.Symbols;
public class SymVector implements Iterable<Expr> {
protected Vector<Expr> data = new Vector<Expr>();
public SymVector() {
}
public SymVector(int size) {
data.setSize(size);
}
public SymVector(Expr[] array) {
for(Expr e : array)
data.add(e);
}
public SymVector(Expr[] array, int startPos, int length) {
for(int i=startPos; i<startPos+length; i++)
data.add(array[i]);
}
public SymVector(double[] array) {
for(double e : array)
data.add(Expr.valueOf(e));
}
public SymVector(double[] array, int startPos, int length) {
for(int i=startPos; i<startPos+length; i++)
data.add(Expr.valueOf(array[i]));
}
public SymVector(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 add(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("\\left[ {\\begin{array}{c}");
for(int j=0; j<data.size(); j++) {
sb.append(data.get(j)+"\\\\\n");
}
sb.append("\\end{array} } \\right]");
return sb.toString();
}
@Override
public Iterator<Expr> iterator() {
return data.iterator();
}
public SymVector subs(Expr from, Expr to) {
SymVector rlt = new SymVector();
for(Expr e : data) {
rlt.add(e.subs(from, to));
}
return rlt;
}
public SymVector diff(Expr expr) {
SymVector rlt = new SymVector();
for(Expr e : data) {
rlt.add(e.diff(expr));
}
return rlt;
}
public NumVector toNumVector(Expr[] args) {
NumVector ret = new NumVector(this, args);
return ret;
}
}