Nothing
###
### $Id: bisection.search.R 833 2014-06-27 16:17:07Z proebuck $
###
### fields, Tools for spatial data
### Copyright 2004-2007, Institute for Mathematics Applied Geosciences
### University Corporation for Atmospheric Research
### Used with permission of Doug Nychka under Artistic license (2008)
## :KRC: Should this be placed as an internal function inside the
## .generic.trim function that is the only thing that ever uses it.
## What does this function do?
## What do the inputs mean?
##-----------------------------------------------------------------------------
"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)
}
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