https://github.com/cran/fields
Tip revision: ce722edae3c1b9e1af2985ce3500b11058facf0e authored by Doug Nychka on 24 August 2006, 01:46:17 UTC
version 3.04
version 3.04
Tip revision: ce722ed
bisection.search.R
"bisection.search" <-
function (x1, x2, f, tol = 1e-07, niter = 25, f.extra = NA, upcross.level = 0)
{
f1 <- f(x1, f.extra) - upcross.level
f2 <- f(x2, f.extra) - upcross.level
if (f1 > f2)
stop(" f1 must be < f2 ")
iter <- niter
for (k in 1:niter) {
xm <- (x1 + x2)/2
fm <- f(xm, f.extra) - upcross.level
if (fm < 0) {
x1 <- xm
f1 <- fm
}
else {
x2 <- xm
f2 <- fm
}
if (abs(fm) < tol) {
iter <- k
break
}
}
xm <- (x1 + x2)/2
fm <- f(xm, f.extra) - upcross.level
list(x = xm, fm = fm, iter = iter)
}