• ← Rationalize
• → RealSign

RealAbs

Abs (Real) (WMA link)

RealAbs[x]

returns the absolute value of a real number x.

RealAbs is also known as modulus. It is evaluated if x can be compared with $0$.

• • RealAbs[-3.]

RealAbs[z] is left unevaluated for complex z:

• • RealAbs[2. + 3. I]

• • D[RealAbs[x ^ 2], x]