fixedpoint {spuRs} | R Documentation |
Applies the fixed point algorithm to find x such that ftn(x) == x.
fixedpoint(ftn, x0, tol = 1e-09, max.iter = 100)
ftn |
the function. |
x0 |
is the initial guess at the fixed point. |
tol |
distance of successive iterations at which algorithm terminates. |
max.iter |
maximum number of iterations. |
We assume that ftn is a function of a single variable.
Returns the value of x at which ftn(x) == x. If the function fails to converge within max.iter iterations, returns NULL.
Jones, O.D., R. Maillardet, and A.P. Robinson. 2009. An Introduction to Scientific Programming and Simulation, Using R. Chapman And Hall/CRC.
ftn1 <- function(x) return(exp(exp(-x)))
fixedpoint(ftn1, 2, tol = 1e-6)