interpolació y sp-line

polinomi de interpolació:

P(x) = ( (x+(-1)·x_{i+(-k)})...(x+(-1)·x_{i+k}) )·...

... ( 1/( (x_{i}+(-1)·x_{i+(-k)})...(x_{i}+(-1)·x_{i+k}) ) )·f(x_{i})

P(x_{i}) = f(x_{i})

polinomi sp-line:

P(x) = ( (x+(-1)·x_{i+(-k)})...(x+(-1)·x_{i+k}) )·( 1+(x+(-1)·x_{i})^{m} )·...

... ( 1/( (x_{i}+(-1)·x_{i+(-k)})...(x_{i}+(-1)·x_{i+k}) ) )·f(x_{i})

P(x_{i}) = f(x_{i})