The absolute value of a
complex number z=(r,i) is |z| or
abs(z), and can be found using good old
trigonometry: |z| =
sqrt(r
2 + i
2)
The absolute value of an n-dimentional vector v = (x1, x2, ... , xn) can similarly be found thus: |v| = sqrt(x12 + x22 + ... + xn2)