Consecutive identical eigenproblems give different results

[CluelessGuru]

Expected behavior

If 2 identical consecutive eigenproblems are solved the results should be identical

Actual behavior

They are not because the lapack random number generator is initialized only once for the first eigenproblem and never again.
Hence the starting vector for the 2 identical consecutive eigenproblems are not the same and the final result differes.

Where/how to reproduce the problem

• arpack-ng: release
• OS: ubuntu
• compiler: gcc

Steps to reproduce the problem

Solve 2 identical consecutive eigenvalue problems.

[fghoussen]

No solution for now. Duplicate : #218

[fghoussen]

and the final result differes.

BTW, how much in norm for instance? 1.e-6 in double? 1.e-3 in float? more?