Hi,
I understand you are asking for the significance of rounding function in Simulink.
Rounding function is applied to input signal and rounds each element of the input signal to produce the output signal.
Based on the selected rounding function, the input signal is processed to produce output signal with same type and dimensions as input.
Possible values for rounding function are : floor (default), ceil, round or fix.
floor - rounds elements to nearest integer value towards minus infinity.
ceil - rounds elements to nearest integer value towards positive infinity.
fix - rounds elements to nearest integer value towards zero.
round - rounds elements to nearest integer.
Refer to the below link for more details:
