Examples of Array2DRowRealMatrix

org.apache.commons.math.linear.Array2DRowRealMatrix
ath.gatech.edu/~bourbaki/math2601/Web-notes/2num.pdf"> LU decomposition to support linear system solution and inverse.
The LU decomposition is performed as needed, to support the following operations:
- solve
- isSingular
- getDeterminant
- inverse
Usage notes:
- The LU decomposition is cached and reused on subsequent calls. If data are modified via references to the underlying array obtained using getDataRef(), then the stored LU decomposition will not be discarded. In this case, you need to explicitly invoke LUDecompose() to recompute the decomposition before using any of the methods above.
- As specified in the {@link RealMatrix} interface, matrix element indexingis 0-based -- e.g., getEntry(0, 0) returns the element in the first row, first column of the matrix.
@version $Revision: 1073158 $ $Date: 2011-02-21 22:46:52 +0100 (lun. 21 févr. 2011) $
org.apache.commons.math3.linear.Array2DRowRealMatrix
Implementation of {@link RealMatrix} using a {@code double[][]} array tostore entries. @version $Id: Array2DRowRealMatrix.java 1296537 2012-03-03 00:45:19Z sebb $

Examples of org.apache.commons.math3.linear.Array2DRowRealMatrix

        for (int r = 0; r < m.getRowDimension(); r++) {
            for (int c = 0; c < m.getColumnDimension(); c++) {
                d[r][c] = FastMath.log(m.getEntry(r, c));
            }
        }
        return new Array2DRowRealMatrix(d, false);
    }

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Examples of org.apache.commons.math3.linear.Array2DRowRealMatrix

        for (int r = 0; r < m.getRowDimension(); r++) {
            for (int c = 0; c < m.getColumnDimension(); c++) {
                d[r][c] = FastMath.sqrt(m.getEntry(r, c));
            }
        }
        return new Array2DRowRealMatrix(d, false);
    }

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Examples of org.apache.commons.math3.linear.Array2DRowRealMatrix

            for (int c = 0; c < m.getColumnDimension(); c++) {
                double e = m.getEntry(r, c);
                d[r][c] = e * e;
            }
        }
        return new Array2DRowRealMatrix(d, false);
    }

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Examples of org.apache.commons.math3.linear.Array2DRowRealMatrix

        for (int r = 0; r < m.getRowDimension(); r++) {
            for (int c = 0; c < m.getColumnDimension(); c++) {
                d[r][c] = m.getEntry(r, c) * n.getEntry(r, c);
            }
        }
        return new Array2DRowRealMatrix(d, false);
    }

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Examples of org.apache.commons.math3.linear.Array2DRowRealMatrix

        for (int r = 0; r < m.getRowDimension(); r++) {
            for (int c = 0; c < m.getColumnDimension(); c++) {
                d[r][c] = m.getEntry(r, c) / n.getEntry(r, c);
            }
        }
        return new Array2DRowRealMatrix(d, false);
    }

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Examples of org.apache.commons.math3.linear.Array2DRowRealMatrix

        for (int r = 0; r < m.getRowDimension(); r++) {
            for (int c = 0; c < cols.length; c++) {
                d[r][c] = m.getEntry(r, cols[c]);
            }
        }
        return new Array2DRowRealMatrix(d, false);
    }

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Examples of org.apache.commons.math3.linear.Array2DRowRealMatrix

        for (int r = 0; r < m.getRowDimension(); r++) {
            for (int c = 0; c < m.getColumnDimension(); c++) {
                d[r][c] = r <= c - k ? m.getEntry(r, c) : 0;
            }
        }
        return new Array2DRowRealMatrix(d, false);
    }

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Examples of org.apache.commons.math3.linear.Array2DRowRealMatrix

            for (int r = 0; r < m.getRowDimension(); r++) {
                sum += m.getEntry(r, c);
            }
            d[0][c] = sum;
        }
        return new Array2DRowRealMatrix(d, false);
    }

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Examples of org.apache.commons.math3.linear.Array2DRowRealMatrix

        if (m.getColumnDimension() == 1) {
            final double[][] d = new double[m.getRowDimension()][m.getRowDimension()];
            for (int i = 0; i < m.getRowDimension(); i++) {
                d[i][i] = m.getEntry(i, 0);
            }
            return new Array2DRowRealMatrix(d, false);
        } else {
            final double[][] d = new double[m.getRowDimension()][1];
            for (int i = 0; i < m.getColumnDimension(); i++) {
                d[i][0] = m.getEntry(i, i);
            }
            return new Array2DRowRealMatrix(d, false);
        }
    }

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Examples of org.apache.commons.math3.linear.Array2DRowRealMatrix

    private static RealMatrix ones(int n, int m) {
        final double[][] d = new double[n][m];
        for (int r = 0; r < n; r++) {
            Arrays.fill(d[r], 1);
        }
        return new Array2DRowRealMatrix(d, false);
    }

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