Lagrange interpolation polynomial
Calculate the Lagrange interpolation polynomial, or list of polynomials, given a set of (x, y) points to fit
poly_calc(x, y, tol = sqrt(.Machine$double.eps), lab = dimnames(y)[[2]]) poly_from_zeros(...) poly_from_roots(...) poly_from_roots(...) poly_from_values(x, y, tol = sqrt(.Machine$double.eps), lab = dimnames(y)[[2]])
x |
A numeric vector of x-points at which the y-values are specified. |
y |
Either a numeric vector of the same length as |
tol |
A numeric tolerance for duplicated |
lab |
A character string vector of names for the list result when |
... |
A list of specified zeros (for subsidiary functions) |
An interpolation polynomial, or list of interpolating polynomials.
(p <- poly_calc(0:5)) ## same as poly_from_zeros(0:5) (p <- poly_calc(0:5, exp(0:5))) plot(p) curve(exp, add = TRUE, col = "red")
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