Syntax

frac(x)

Description

frac(x) represents the “fractional part” x-floor(x) of the number x.

For complex arguments, frac is applied separately to the real and imaginary part.

For real numbers, the value x-floor(x) represented by frac(x) is a number from the interval . For positive arguments, you may think of frac as truncating all digits before the decimal point.

For integer arguments, 0 is returned. For rational arguments, a rational number is returned. For arguments that contain symbolic identifiers, symbolic function calls are returned. For floating-point arguments or non-rational exact expressions, floating-point values are returned.

Cited as：

https://www.mathworks.com/help/symbolic/mupad_ref/frac.html

https://mathworld.wolfram.com/FractionalPart.html