Number of underflows
y = nunderflows(a)
y = nunderflows(q)
y = nunderflows(a) returns the number of underflows of fi object a since logging was turned on or since the last time the log was reset for the object.
Turn on logging by setting the fipref property LoggingMode to on. Reset logging for a fi object using the resetlog function.
y = nunderflows(q) returns the accumulated number of underflows resulting from quantization operations performed by a quantizer object q.