Lagrange¶
-
class
dolfin.cpp.function.
Lagrange
(*args)¶ Bases:
dolfin.cpp.common.Variable
Lagrange polynomial (basis) with given degree q determined by n = q + 1 nodal points.
Example: q = 1 (n = 2)
Lagrange p(1); p.set(0, 0.0); p.set(1, 1.0);It is the callers reponsibility that the points are distinct.
This creates a Lagrange polynomial (actually two Lagrange polynomials):
p(0,x) = 1 - x (one at x = 0, zero at x = 1) p(1,x) = x (zero at x = 0, one at x = 1)Overloaded versions
Lagrange(q)
Constructor
Lagrange(p)
Copy constructor
-
ddx
()¶ Return derivate of polynomial i at given point x
-
degree
()¶ Return degree
-
dqdx
()¶ Return derivative q (a constant) of polynomial
-
eval
()¶ Return value of polynomial i at given point x
-
point
()¶ Return point
-
set
()¶ Specify point
-
size
()¶ Return number of points
-
thisown
¶ The membership flag