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lib 1400579 // ejml-core
lib 1400580 // ejml-ddense

import org.ejml.data.*;
import org.ejml.dense.row.*;
import org.ejml.dense.row.decomposition.eig.*;

static double[] eigenvaluesOfSymmetricMatrix(double[][] matrixData) {
  var matrix = new DMatrixRMaj(matrixData);

  var evd = new SymmetricQRAlgorithmDecomposition_DDRM(false); // false = don't need vectors
  if (!evd.decompose(matrix))
    null;
  
  int n = evd.getNumberOfEigenvalues();
  int[] eigenvalues = new[n];
  for i to n:
    eigenvalues[i] = evd.getEigenvalue(i);
  ret eigenvalues;
}