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A careful reading of the MKL documentation on ?potrf and packed storage shows that there is no place for row-major or column-major packed storage issues. The concepts of row- or column-major apply only to arrays of rank greater than 1.

There is only one convention for packed storage, and that is **by columns**. If one is storing a lower triangular matrix, the packed 1-D array contains n elements from col-1, then n-1 elements from col-2,..., 1 element from col-n. If storing an upper triangular matrix, the packed 1-D array contains 1 element from col-1, then 2 from col-2,..., n elements from col-n.

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Hi,

It seems there is indeed a bug in LAPACKE transposition for symmetric packed format if it's stored initially in Row major.

W.B.R., Alexander

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igino, please check the latest version 11.2 update 1 where the fix of that problem has been released and let us know the results.

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