commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/BlockFieldMatrix.java [1224:1260]:
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                final int      pStart   = iBlock * BLOCK_SIZE;
                final int      pEnd     = JdkMath.min(pStart + BLOCK_SIZE, columns);
                final int      qStart   = jBlock * BLOCK_SIZE;
                final int      qEnd     = JdkMath.min(qStart + BLOCK_SIZE, rows);
                int k = 0;
                for (int p = pStart; p < pEnd; ++p) {
                    final int lInc = pEnd - pStart;
                    int l = p - pStart;
                    for (int q = qStart; q < qEnd; ++q) {
                        outBlock[k] = tBlock[l];
                        ++k;
                        l+= lInc;
                    }
                }

                // go to next block
                ++blockIndex;
            }
        }

        return out;
    }

    /** {@inheritDoc} */
    @Override
    public int getRowDimension() {
        return rows;
    }

    /** {@inheritDoc} */
    @Override
    public int getColumnDimension() {
        return columns;
    }

    /** {@inheritDoc} */
    @Override
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commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/BlockRealMatrix.java [1222:1257]:
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                final int pStart = iBlock * BLOCK_SIZE;
                final int pEnd = JdkMath.min(pStart + BLOCK_SIZE, columns);
                final int qStart = jBlock * BLOCK_SIZE;
                final int qEnd = JdkMath.min(qStart + BLOCK_SIZE, rows);
                int k = 0;
                for (int p = pStart; p < pEnd; ++p) {
                    final int lInc = pEnd - pStart;
                    int l = p - pStart;
                    for (int q = qStart; q < qEnd; ++q) {
                        outBlock[k] = tBlock[l];
                        ++k;
                        l+= lInc;
                    }
                }
                // go to next block
                ++blockIndex;
            }
        }

        return out;
    }

    /** {@inheritDoc} */
    @Override
    public int getRowDimension() {
        return rows;
    }

    /** {@inheritDoc} */
    @Override
    public int getColumnDimension() {
        return columns;
    }

    /** {@inheritDoc} */
    @Override
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