##### https://github.com/cran/nacopula

Revision

**161411bb86f97e5a8bd89091cd61d03a33c2761a**authored by Martin Maechler on**06 February 2012, 00:00 UTC**, committed by Gabor Csardi on**06 February 2012, 00:00 UTC****1 parent**5bc804b

Tip revision:

**161411bb86f97e5a8bd89091cd61d03a33c2761a**authored by**Martin Maechler**on**06 February 2012, 00:00 UTC****version 0.8-0** Tip revision:

**161411b** utils.R

```
## Catch and save both warnings and errors and in the case of
## a warning, also keep the computed result
tryCatch.W.E <- function(expr){
W <- NULL
w.handler <- function(w){ # warning handler
W <<- w
invokeRestart("muffleWarning")
}
list(value = withCallingHandlers(tryCatch(expr, error = function(e) e),
warning = w.handler), warning = W)
}
##' @title If needed, get file from internet - but do not "error out"
##' @param file
##' @param remoteDIR
##' @param method download method
##' @param mode writing mode, see ?download.file
##' @param ... potentially further arguments to download.file()
##' @return logical: TRUE if download succeeded
##' @author Martin Maechler (22 Mar 2011)
canGet <- function(file,
remoteDIR = "http://nacopula.r-forge.r-project.org/resources",
method, mode = "wb", ...)
{
if(file.exists(file))
return(TRUE)
## else try to down load it
fullURL <- file.path(remoteDIR, file)
r <- tryCatch( download.file(fullURL, destfile = file,
method=method, mode=mode, ...),
error = function(e) e, warning = function(w) w)
ok <- !is(r, "condition") && r == 0
if(!ok && file.exists(file)) ## try to remove a newly created empty file
tryCatch(file.remove(file), error = function(e){})
ok
}
if(FALSE)## is now in
system.file(package="Matrix", "test-tools-1.R")
##' Compute the relative error between target and current vector
##' @title Relative Error (:= 0 when absolute error == 0)
##' @param target
##' @param current
##' @return vector of the same length as target and current
##' @author Martin Maechler
relErrV <- function(target, current) {
## relative error, but give 0 when absolute error==0
## assert( <length current> is multiple of <length target>) :
n <- length(target <- as.vector(target))
if(length(current) %% n)
stop("length(current) must be a multiple of length(target)")
RE <- current
RE[] <- 0
fr <- current/target
neq <- is.na(current) | (current != target)
RE[neq] <- 1 - fr[neq]
RE
}
##' @title Number of correct digits - recoding "Inf" to 'zeroDigs'
##' @param target numeric vector of "true" values
##' @param current numeric vector of "approximate" values
##' @param zeroDigs how many correct digits should zero error give
##' @return
##' @author Martin Maechler
nCorrDigits <- function(target, current, zeroDigs = 16) {
stopifnot(zeroDigs >= -log10(.Machine$double.eps))# = 15.65
RE <- relErrV(target, current)
r <- -log10(abs(RE))
r[RE == 0] <- zeroDigs
r[is.na(RE) | r < 0] <- 0 # no correct digit, when relErr is NA
r
}
```

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