Numerical clamp of .fmu export

Hi,

I've got a model containing a LTI system with a discrete dynamic implemented in Stateflow. I'm using a fixed step solver discrete (no continues states) so the integration is explicitly performed through Euler Forward method inside the Stateflow through the following formula: x = Ad*x_prev+Bd*u.

Specifically matrix Ad is as follows:

Ad =

0.999988000000000 0.000010000000000

0.000012500000000 0.999984375000000

When I perform the .fmu export matrix and I compare the Simulink model with the .fmu the behaviors are different due to a numerical clamp of matrix Ad which results as follows:

Ad =

0.99999 0.000019

0.0000125 0.99998

.fmu export is performed by using Save -> Standalone FMU and by keeping all default settings.

Could you help me? I don't know why this clamping occurs.

Some remarks:

1. Ad is a double;
2. I've tried to generate C code from the same block and Ad didn't figure out this clamping.

Kind regards,

Marco