使用Java实现主成分分析算法
时间: 2023-05-24 22:02:07 浏览: 78
OK,下面是使用Java实现主成分分析算法的代码:
```java
public static void main(String[] args) {
double[][] data = {{1, 2}, {2, 3}, {3, 4}, {4, 5}, {5, 6}};
PCA pca = new PCA(data);
pca.pca();
double[][] result = pca.getResult();
for (int i = 0; i < result.length; i++) {
System.out.println(result[i][0] + ", " + result[i][1]);
}
}
public class PCA {
private final double[][] data;
private final int n;
private final int d;
private double[][] result;
public PCA(double[][] data) {
this.data = data;
this.n = data.length;
this.d = data[0].length;
}
public void pca() {
double[] mean = new double[d];
for (int i = 0; i < n; i++) {
for (int j = 0; j < d; j++) {
mean[j] += data[i][j];
}
}
for (int j = 0; j < d; j++) {
mean[j] /= n;
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < d; j++) {
data[i][j] -= mean[j];
}
}
Matrix X = new Matrix(data);
Matrix X_T = X.transpose();
Matrix C = X_T.times(X).times(1.0/n);
EigenvalueDecomposition eig = C.eig();
Matrix V = eig.getV();
Matrix Y = X.times(V);
double[][] res = new double[n][2];
for (int i = 0; i < n; i++) {
res[i][0] = Y.get(i, 0);
res[i][1] = Y.get(i, 1);
}
result = res;
}
public double[][] getResult() {
return result;
}
}
```
希望对你有帮助!
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