Smallest positive normalized fixed-point value or quantized number
x=realmin(a) is the smallest positive real-world value that can be represented in the data type of fi object a. Anything smaller than x underflows or is an IEEE® "denormal" number.
x=realmin(q) is the smallest positive normal quantized number where q is a quantizer object. Anything smaller than x underflows or is an IEEE "denormal" number.