import java.util.*; import java.util.zip.*; import java.util.List; import java.util.regex.*; import java.util.concurrent.*; import java.util.concurrent.atomic.*; import java.util.concurrent.locks.*; import java.util.function.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.text.*; import javax.swing.table.*; import java.io.*; import java.net.*; import java.lang.reflect.*; import java.lang.ref.*; import java.lang.management.*; import java.security.*; import java.security.spec.*; import java.awt.*; import java.awt.event.*; import java.awt.image.*; import java.awt.geom.*; import javax.imageio.*; import java.math.*; import java.time.Duration; import org.ejml.data.*; import org.ejml.dense.row.*; import org.ejml.dense.row.decomposition.eig.*; class main { // ejml-core // ejml-ddense static double[][] invertMatrix(double[][] matrixData) { var matrix = new DMatrixRMaj(matrixData); if (!CommonOps_DDRM.invert(matrix)) return null; // unable to invert matrix return ejmlMatrixToArray(matrix); } static double[][] ejmlMatrixToArray(DMatrixRMaj matrix) { int w = matrix.getNumCols(), h = matrix.getNumRows(); double[][] array = new double[h][w]; for (int y = 0; y < h; y++) for (int x = 0; x < w; x++) array[y][x] = matrix.get(y, x); return array; } }