gaussd (x, m, s)Gaussian distribution ("Bell Curve") with mean-value = m and standard-deviation = s.
min (a, b)Returns the lesser of the two values
max (a, b)Returns the greater of the two values
round (x)Rounds x up or down to the closest integer
floor (x)Rounds x down
ceil (x)Rounds x up
abs (x)Absolute value of x (also |x|)
sgn (x)
Sign of x : 1 for x > 0
 0 for x = 0
-1 for x < 0