commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/BlockRealMatrix.java [307:325]:
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        checkAdd(m);

        final BlockRealMatrix out = new BlockRealMatrix(rows, columns);

        // perform addition block-wise, to ensure good cache behavior
        int blockIndex = 0;
        for (int iBlock = 0; iBlock < out.blockRows; ++iBlock) {
            for (int jBlock = 0; jBlock < out.blockColumns; ++jBlock) {

                // perform addition on the current block
                final double[] outBlock = out.blocks[blockIndex];
                final double[] tBlock   = blocks[blockIndex];
                final int pStart = iBlock * BLOCK_SIZE;
                final int pEnd = JdkMath.min(pStart + BLOCK_SIZE, rows);
                final int qStart = jBlock * BLOCK_SIZE;
                final int qEnd = JdkMath.min(qStart + BLOCK_SIZE, columns);
                int k = 0;
                for (int p = pStart; p < pEnd; ++p) {
                    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 [375:393]:
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        checkAdd(m);

        final BlockRealMatrix out = new BlockRealMatrix(rows, columns);

        // perform subtraction block-wise, to ensure good cache behavior
        int blockIndex = 0;
        for (int iBlock = 0; iBlock < out.blockRows; ++iBlock) {
            for (int jBlock = 0; jBlock < out.blockColumns; ++jBlock) {

                // perform subtraction on the current block
                final double[] outBlock = out.blocks[blockIndex];
                final double[] tBlock = blocks[blockIndex];
                final int pStart = iBlock * BLOCK_SIZE;
                final int pEnd = JdkMath.min(pStart + BLOCK_SIZE, rows);
                final int qStart = jBlock * BLOCK_SIZE;
                final int qEnd = JdkMath.min(qStart + BLOCK_SIZE, columns);
                int k = 0;
                for (int p = pStart; p < pEnd; ++p) {
                    for (int q = qStart; q < qEnd; ++q) {
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