src/main/java/org/apache/datasketches/vector/matrix/MatrixImplOjAlgo.java [118:126]:
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    final int outBytes = (int) (((long)preLongs * Long.BYTES) + (numElements * Double.BYTES));
    final byte[] outByteArr = new byte[outBytes];
    final WritableMemory memOut = WritableMemory.wrap(outByteArr);
    final Object memObj = memOut.getArray();
    final long memAddr = memOut.getCumulativeOffset(0L);

    MatrixPreambleUtil.insertPreLongs(memObj, memAddr, preLongs);
    MatrixPreambleUtil.insertSerVer(memObj, memAddr, MatrixPreambleUtil.SER_VER);
    MatrixPreambleUtil.insertFamilyID(memObj, memAddr, MatrixFamily.MATRIX.getID());
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src/main/java/org/apache/datasketches/vector/matrix/MatrixImplOjAlgo.java [150:158]:
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    final int outBytes = (int) (((long)preLongs * Long.BYTES) + (numElements * Double.BYTES));
    final byte[] outByteArr = new byte[outBytes];
    final WritableMemory memOut = WritableMemory.wrap(outByteArr);
    final Object memObj = memOut.getArray();
    final long memAddr = memOut.getCumulativeOffset(0L);

    MatrixPreambleUtil.insertPreLongs(memObj, memAddr, preLongs);
    MatrixPreambleUtil.insertSerVer(memObj, memAddr, MatrixPreambleUtil.SER_VER);
    MatrixPreambleUtil.insertFamilyID(memObj, memAddr, MatrixFamily.MATRIX.getID());
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