有人可以帮我找到以下代码中的错误。我收到一个 Java 异常，但我不知道它为什么会发生。感谢您的关注！异常描述如下：
> Exception in thread "main" java.lang.ExceptionInInitializerError
> Caused by: java.lang.ArrayIndexOutOfBoundsException
> at java.lang.System.arraycopy(Native Method)
> at org.ejml.data.DenseMatrix64F.set(Unknown Source)
> at org.ejml.data.DenseMatrix64F.<init>(Unknown Source)
> at org.ejml.simple.SimpleMatrix.<init>(Unknown Source)
> at test1.<clinit>(test1.java:14)
对于此代码：
import org.ejml.simple.SimpleMatrix;
import java.lang.Math;
import java.util.Scanner;
public class test1 {
class testcase3 {
public testcase3() {
Mkt = 100000;
E1name = new SimpleMatrix(2, 5, true, -10, -5, 0, 5, 10, 1, 2, 3,
4, 5);
E1name2 = new SimpleMatrix(2, 5, true, 1, 2, 3, 4, 5, -10, -5, 0,
5, 10);
E2name = new SimpleMatrix(2, 2, true, 1, 3, 1, 2);
E2name2 = new SimpleMatrix(2, 2, true, 1, 2, 1, 3);
EM1 = new SimpleMatrix(2, 5, true, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
EM2 = new SimpleMatrix(2, 2, true, 0, 0, 0, 0);
T = new SimpleMatrix(2, 2, true, 0, 0, 0, 0);
Pa = new SimpleMatrix(1, 2, true, 0, 0);
Position = 0;
}
public double Mkt;
public SimpleMatrix E1name;
public SimpleMatrix E2name;
public SimpleMatrix E1name2;
public SimpleMatrix E2name2;
public SimpleMatrix EM1;
public SimpleMatrix EM2;
public SimpleMatrix T;
public SimpleMatrix Pa;
public int Position;
public int newBidAsk(double bidPrice, double askPrice) {
// log("I received a new Top-of-Book update, bid=" + bidPrice +
// ", offer=" + askPrice);
// data transformation
double newMkt = (bidPrice + askPrice) / 2;
double Grow = newMkt - Mkt;
double Spread = (askPrice - bidPrice) / 2;
SimpleMatrix seq = new SimpleMatrix(1, 2, true, Grow, Spread);
SimpleMatrix z = new SimpleMatrix(1, 2, true, 0, 0);
z.set(0, 0, Nametrans(seq.getIndex(0, 0), E1name));
z.set(0, 1, Nametrans(seq.getIndex(0, 1), E2name));
int act = 0;
// parameter updating
SimpleMatrix Px = Hmmupdate(Pa, z, EM1, EM2);
SimpleMatrix newPa = Hmmpredict(Px, T);
SimpleMatrix E1n = Hmmempredict(newPa, EM1, EM2, 5);
SimpleMatrix E2n = Hmmempredict(newPa, EM1, EM2, 2);
SimpleMatrix E = Eab(newMkt, E1n, E2n, E1name2, E2name2);
int E1 = E.getIndex(0, 0);
int E2 = E.getIndex(0, 1);
// action
if (Position == 0) {
int L = (int) Math.max(0,
Math.max(E1 - askPrice, bidPrice - E2));
switch (L) {
case 1:
act = 0;
break;
case 2:
act = 1;
break;
case 3:
act = -1;
break;
}
} else if (Position == -1) {
int L = (int) Math.max(-askPrice, -E1);
switch (L) {
case 1:
act = 1;
break;
case 2:
act = 0;
break;
}
} else if (Position == 1) {
int L = (int) Math.max(bidPrice, E2);
switch (L) {
case 1:
act = -1;
break;
case 2:
act = 0;
break;
}
}
Position = act + Position;
// log("The act is " + Position);
return Position;
}
public SimpleMatrix Eab(double Mkt, SimpleMatrix E1, SimpleMatrix E2,
SimpleMatrix E1name2, SimpleMatrix E2name2) {
SimpleMatrix Easkbid = new SimpleMatrix(1, 2, true, Mkt, Mkt);
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 2; j++) {
Easkbid.set(0, 0,
Easkbid.getIndex(0, 0) + (Nametrans(i, E1name2))
* E1.getIndex(0, i) * E2.getIndex(0, j));
Easkbid.set(0, 1,
Easkbid.getIndex(0, 1) + (Nametrans(i, E2name2))
* E1.getIndex(0, i) * E2.getIndex(0, j));
}
}
return Easkbid;
}
public SimpleMatrix Hmmempredict(SimpleMatrix Pxkla, SimpleMatrix EM1,
SimpleMatrix EM2, int length) {
SimpleMatrix E = new SimpleMatrix(1, length, true);
for (int i = 0; i < 2; i++) {
for (int j = 0; j < length; j++) {
E.set(1,
j,
E.getIndex(1, j) + EM2.getIndex(i, j)
* Pxkla.getIndex(1, i));
}
}
E = normalize(E);
return E;
}
public SimpleMatrix Hmmpredict(SimpleMatrix Pxk, SimpleMatrix T) {
SimpleMatrix Pxkla = new SimpleMatrix(1, 2, true, 0, 0);
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
Pxkla.set(0, i, Pxkla.getIndex(0, i) + Pxkla.getIndex(0, j)
* T.getIndex(j, i));
}
}
Pxkla = normalize(Pxkla);
return Pxkla;
}
public SimpleMatrix Hmmupdate(SimpleMatrix Pxka, SimpleMatrix zk,
SimpleMatrix EM1, SimpleMatrix EM2) {
SimpleMatrix Pxk = new SimpleMatrix(1, 2, true, 0, 0);
for (int i = 0; i < 2; i++) {
Pxk.set(0,
i,
(Pxka.getIndex(0, i)
* EM1.getIndex(i, zk.getIndex(0, 0)) * EM2
.getIndex(i, zk.getIndex(0, 1))));
}
Pxk = normalize(Pxk);
return Pxk;
}
public SimpleMatrix normalize(SimpleMatrix B) {
double temp = 0;
for (int i = 0; i < B.numCols(); i++) {
temp = B.getIndex(0, i);
}
SimpleMatrix A = B;
for (int j = 0; j < A.numCols(); j++) {
A.set(0, j, B.getIndex(0, j) / temp);
}
return A;
}
public double Nametrans(double a, SimpleMatrix Nama) {
int n = Nama.numCols();
double b = 0;
for (int i = 0; i < n; i++) {
if (a == Nama.getIndex(0, i)) {
b = Nama.getIndex(1, i);
}
}
return b;
}
}
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
double bid = s.nextDouble();
double ask = s.nextDouble();
testcase3 tc3;
int act = tc3.newBidAsk(bid, ask);
System.out.printf("%d", act);
}
}