RandomSample (Built-in Mathematica Symbol)

RandomSample[{e_1, e_2, ...}, n] gives a pseudorandom sample of n of the e_i.RandomSample[{w_1, w_2, ...} -> {e_1, e_2, ...}, n] gives a pseudorandom sample of n of the e_i ...

Read (Built-in Mathematica Symbol)

Read[stream] reads one expression from an input stream and returns the expression. Read[stream, type] reads one object of the specified type. Read[stream, {type_1, type_2, ...

RealExponent (Built-in Mathematica Symbol)

RealExponent[x] gives log_10 (|x|).RealExponent[x, b] gives log_b (|x|).

Real (Built-in Mathematica Symbol)

Real is the head used for real (floating-point) numbers.

ReflectionTransform (Built-in Mathematica Symbol)

ReflectionTransform[v] gives a TransformationFunction that represents a reflection in a mirror through the origin, normal to the vector v.ReflectionTransform[v, p] gives a ...

RiemannSiegelTheta (Built-in Mathematica Symbol)

RiemannSiegelTheta[t] gives the Riemann\[Dash]Siegel function \[CurlyTheta](t).

RiemannSiegelZ (Built-in Mathematica Symbol)

RiemannSiegelZ[t] gives the Riemann\[Dash]Siegel function Z(t).

ScalingTransform (Built-in Mathematica Symbol)

ScalingTransform[{s_x, s_y, ...}] gives a TransformationFunction that represents scaling by a factor s_i along each coordinate axis from the origin.ScalingTransform[{s_x, ...

Scan (Built-in Mathematica Symbol)

Scan[f, expr] evaluates f applied to each element of expr in turn. Scan[f, expr, levelspec] applies f to parts of expr specified by levelspec.

Select (Built-in Mathematica Symbol)

Select[list, crit] picks out all elements e_i of list for which crit[e_i] is True. Select[list, crit, n] picks out the first n elements for which crit[e_i] is True.