Unitize (Built-in Mathematica Symbol)

Unitize[x] gives 0 when x is zero, and 1 when x has any other numerical value.

UnitStep (Built-in Mathematica Symbol)

UnitStep[x] represents the unit step function, equal to 0 for x < 0 and 1 for x >= 0. UnitStep[x_1, x_2, ...] represents the multidimensional unit step function which is 1 ...

UnitTriangle (Built-in Mathematica Symbol)

UnitTriangle[x] represents the unit triangle function on the interval |x| <= 1 .UnitTriangle[x_1, x_2, ...] represents the multidimensional unit triangle function on the ...

UnitVector (Built-in Mathematica Symbol)

UnitVector[k] gives the two-dimensional unit vector in the k\[Null]^th direction.UnitVector[n, k] gives the n-dimensional unit vector in the k\[Null]^th direction.

Unprotect (Built-in Mathematica Symbol)

Unprotect[s_1, s_2, ...] removes the attribute Protected for the symbols s_i. Unprotect["form_1", "form_2", ...] unprotects all symbols whose names textually match any of the ...

UnsameQ (Built-in Mathematica Symbol)

lhs =!= rhs yields True if the expression lhs is not identical to rhs, and yields False otherwise.

UnsavedVariables (Built-in Mathematica Symbol)

UnsavedVariables is an option for Manipulate, DynamicModule, and related functions that specifies local symbols that should not be saved when the notebook containing them is ...

Unset (Built-in Mathematica Symbol)

lhs =. removes any rules defined for lhs.

UnsetShared (Built-in Mathematica Symbol)

UnsetShared[s_1, s_2, ...] stops the sharing of the variables or functions s_i among parallel kernels.UnsetShared[patt] stops the sharing of all variables and functions whose ...

UpArrowBar (Built-in Mathematica Symbol)

UpArrowBar[x, y, ...] displays as x\[UpArrowBar]y\[UpArrowBar]....