n4sid output different on two computers (system identification toolbox)

After using the n4sid function on one computer to perfectly identify a system model. (I had a couple of M files to do this and an associated CSV file with the data included).

When i transferred the exact same bunch of files to another PC (same matlab version 2015b) the outputted model is different. I have checked the code line by line and there is no difference. And yet the original still functions correctly and the second PC's id is not good enough.

FYI: 1st PC 2015b 64bit 8.6.0.267246 (installed sep 15) Win 7 HP, 2nd PC 2015b 64 bit 8.6.0.267246(installed jan 16) Win 7 Pro.

Obviously there is no change in the matlab version, do they make revisions to the toolboxes and not changes the version numbers?

Whilst I would put it down to some random number generated internally inside the function, the outputs are repeatable on both systems.

All help is appreciated.

[Walter Roberson]

Is one of them an Intel processor and the other an AMD processor?

How different are the outputs?

[Craig Hamer]

Thanks for the quick reply,

1 - the 1st PC is an intel Core I5, the 2nd is an intel Core 2 Duo.

2 - the difference in performance...

on PC 1 - a 2 state system evaluates to:

A=[1.176 -0.01145; 69.36 0.1437] B=[-0.1763 0.00199; -69.36 0.1305]

on PC 2 - a 2 state system evaluates to:

A=[1.11 ns; 2344 0.2203] B=[-0.1097 ns; -2344 0.1462] (ns=negligibly small to write here)

[Adithya Addanki]

Hi Craig,

Please send us the model, the M files, including any data files you mentioned before. This may help us reproduce the issue at our end and investigate it further.

I look forward for your response.

Thank you, Adithya