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Functions and commands 423
UFACTOR Factorizes a unit in a unit object.
ufactor(Unit,Unit)
unapply Returns the function defined by an expression and a variable.
unapply(Expr,Var)
Example:
unapply(2*x^2,x) gives (x)->2*x^2
UNTIL Used in programming to indicate the conditions under which
a statement should stop being executed.
USIMPLIFY Simplifies a unit in a unit object.
usimplify(Unit)
valuation Returns the valuation (degree of the term of lowest degree) of
a polynomial. With only a polynomial as argument, the
valuation returned is for x. With a variable as second
argument, the valuation is performed for it.
valuation(Poly,[Var])
Example:
valuation(x^4+x^3) gives 3
variance Returns the variance of a list or the list of variances of the
columns of a matrix. The optional second list is a list of
weights.
variance(Lst||Mtrx,[Lst])
Example:
variance([3,4,2]) gives 2/3
vector With one point as argument, defines a vector from the origin
to the point. With two points as arguments, defines a vector
from the first point to the second point. With a point and a
vector as arguments, defines a vector beginning from the
point and with direction and magnitude of the vector.
vector(Pnt,Pnt||Pnt,Vect)
vertices Returns the list of the vertices of a polygon or polyhedron.
vertices(Polygon or Polyedr)
vertices_abca Returns the closed list [A,B,...A] of the vertices of a polygon or
polyhedron.
vertices_abca(Polygon or Polyedr)