EntropyFilter[image, r] filters image by replacing every value by the information entropy of the values in its range r neighborhood. EntropyFilter[data, r] applies entropy ...
Entropy
(Built-in Mathematica Symbol) Entropy[list] gives the base E information entropy of the values in list.Entropy[k, list] gives the base k information entropy.
Environment["var"] gives the value of an operating system environment variable.
Epilog
(Built-in Mathematica Symbol) Epilog is an option for graphics functions that gives a list of graphics primitives to be rendered after the main part of the graphics is rendered.
Equal
(Built-in Mathematica Symbol) lhs == rhs returns True if lhs and rhs are identical.
EqualTilde[x, y, ...] displays as x \[EqualTilde] y \[EqualTilde] ....
Equilibrium[x, y, ...] displays as x \[Equilibrium] y \[Equilibrium] ....
Equivalent[e_1, e_2, ...] represents the logical equivalence e_1 \[DoubleLeftRightArrow] e_2 \[DoubleLeftRightArrow] ..., giving True when all of the e_i are the same.
Erfc
(Built-in Mathematica Symbol) Erfc[z] gives the complementary error function erfc(z).
Erfi
(Built-in Mathematica Symbol) Erfi[z] gives the imaginary error function erf(i z)/i.