Changed behavior in Pardiso, MKL 11.3.3 vs MKL 11.1.3

[Jens_E_]

Hi,

I recently upgraded from Compser XE 2013SP1U3 to Composer XE 2016U3, and thus from MKL 11.1.3 to MKL 11.3.3. This has caused a slightly changed behavior in the output from Pardiso in the following situations:

1. When trying to "solve" a system of equations of dimension 0 (I have a set of unit tests which for one test degenerates to this case).
   1. 11.1.3: the error code is 0 (no error), so that the solution may be interpreted as the empty vector.
   2. 11.3.3: the error code is -1, indicating "inconsistent input."
2. When trying to solve a system Ax=b in which A is an 5x5 matrix of all zeros, and b is a 5x1 matrix of all zeros. 
   1. 11.1.3: the error code is -7
   2. 11.3.3: the error code is -4

Are these changes expected?

Of course, both cases are degenerate and not of any practical interest. I just need to confirm that this changed behavior does not suggest any errors in my (other) input to Pardiso.

Thanks!

Jens 

[Alexander_K_Intel2]

Hi Jens,

You are correct, we implement input parameters check and removed diagonal matrices branch so mentioned behaviour expected

Thanks,

Alex