• ← Round
• → UnitStep

Sign

Sign (WMA link)

Sign[x]

return -1, 0, or 1 depending on whether x is negative, zero, or positive.

• • Sign[19]

• • Sign[-6]

• • Sign[0]

• • Sign[{-5, -10, 15, 20, 0}]

For a complex number, Sign returns the phase of the number:

• • Sign[3 - 4*I]