commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/BlockRealMatrix.java [1502:1520]:
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                                       final int startRow, final int endRow,
                                       final int startColumn,
                                       final int endColumn)
        throws OutOfRangeException, NumberIsTooSmallException {
        MatrixUtils.checkSubMatrixIndex(this, startRow, endRow, startColumn, endColumn);
        visitor.start(rows, columns, startRow, endRow, startColumn, endColumn);
        for (int iBlock = startRow / BLOCK_SIZE; iBlock < 1 + endRow / BLOCK_SIZE; ++iBlock) {
            final int p0 = iBlock * BLOCK_SIZE;
            final int pStart = JdkMath.max(startRow, p0);
            final int pEnd = JdkMath.min((iBlock + 1) * BLOCK_SIZE, 1 + endRow);
            for (int jBlock = startColumn / BLOCK_SIZE; jBlock < 1 + endColumn / BLOCK_SIZE; ++jBlock) {
                final int jWidth = blockWidth(jBlock);
                final int q0 = jBlock * BLOCK_SIZE;
                final int qStart = JdkMath.max(startColumn, q0);
                final int qEnd = JdkMath.min((jBlock + 1) * BLOCK_SIZE, 1 + endColumn);
                final double[] block = blocks[iBlock * blockColumns + jBlock];
                for (int p = pStart; p < pEnd; ++p) {
                    int k = (p - p0) * jWidth + qStart - q0;
                    for (int q = qStart; q < qEnd; ++q) {
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commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/BlockRealMatrix.java [1533:1551]:
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                                       final int startRow, final int endRow,
                                       final int startColumn,
                                       final int endColumn)
        throws OutOfRangeException, NumberIsTooSmallException {
        MatrixUtils.checkSubMatrixIndex(this, startRow, endRow, startColumn, endColumn);
        visitor.start(rows, columns, startRow, endRow, startColumn, endColumn);
        for (int iBlock = startRow / BLOCK_SIZE; iBlock < 1 + endRow / BLOCK_SIZE; ++iBlock) {
            final int p0 = iBlock * BLOCK_SIZE;
            final int pStart = JdkMath.max(startRow, p0);
            final int pEnd = JdkMath.min((iBlock + 1) * BLOCK_SIZE, 1 + endRow);
            for (int jBlock = startColumn / BLOCK_SIZE; jBlock < 1 + endColumn / BLOCK_SIZE; ++jBlock) {
                final int jWidth = blockWidth(jBlock);
                final int q0 = jBlock * BLOCK_SIZE;
                final int qStart = JdkMath.max(startColumn, q0);
                final int qEnd = JdkMath.min((jBlock + 1) * BLOCK_SIZE, 1 + endColumn);
                final double[] block = blocks[iBlock * blockColumns + jBlock];
                for (int p = pStart; p < pEnd; ++p) {
                    int k = (p - p0) * jWidth + qStart - q0;
                    for (int q = qStart; q < qEnd; ++q) {
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