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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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16
Task/QR-decomposition/Java/qr-decomposition-1.java Normal file
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import Jama.Matrix;
import Jama.QRDecomposition;
public class Decompose {
public static void main(String[] args) {
var matrix = new Matrix(new double[][] {
{12, -51, 4},
{ 6, 167, -68},
{-4, 24, -41},
});
var qr = new QRDecomposition(matrix);
qr.getQ().print(10, 4);
qr.getR().print(10, 4);
}
}

16
Task/QR-decomposition/Java/qr-decomposition-2.java Normal file
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import cern.colt.matrix.impl.DenseDoubleMatrix2D;
import cern.colt.matrix.linalg.QRDecomposition;
public class Decompose {
public static void main(String[] args) {
var a = new DenseDoubleMatrix2D(new double[][] {
{12, -51, 4},
{ 6, 167, -68},
{-4, 24, -41}
});
var qr = new QRDecomposition(a);
System.out.println(qr.getQ());
System.out.println();
System.out.println(qr.getR());
}
}

30
Task/QR-decomposition/Java/qr-decomposition-3.java Normal file
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import java.util.Locale;
import org.apache.commons.math3.linear.Array2DRowRealMatrix;
import org.apache.commons.math3.linear.QRDecomposition;
import org.apache.commons.math3.linear.RealMatrix;
public class Decompose {
public static void main(String[] args) {
var a = new Array2DRowRealMatrix(new double[][] {
{12, -51, 4},
{ 6, 167, -68},
{-4, 24, -41}
});
var qr = new QRDecomposition(a);
print(qr.getQ());
System.out.println();
print(qr.getR());
}
public static void print(RealMatrix a) {
for (double[] u: a.getData()) {
System.out.print("[ ");
for (double x: u) {
System.out.printf(Locale.ROOT, "%10.4f ", x);
}
System.out.println("]");
}
}
}

16
Task/QR-decomposition/Java/qr-decomposition-4.java Normal file
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import org.la4j.Matrix;
import org.la4j.decomposition.QRDecompositor;
public class Decompose {
public static void main(String[] args) {
var a = Matrix.from2DArray(new double[][] {
{12, -51, 4},
{ 6, 167, -68},
{-4, 24, -41},
});
Matrix[] qr = new QRDecompositor(a).decompose();
System.out.println(qr[0]);
System.out.println(qr[1]);
}
}