On 20/02/2015 21:15, RKoenker wrote:
I'm trying to resolve a problem of Namespaces and probably have misunderstood
something basic.
In my quantreg package the function crq() has as its first argument a
formula that typically contains
something like this: Surv(y, ...) ~ foo, where Surv is a function from the
survival package which
quantreg suggests. When this syntax is encountered in ordinary usage Surv
is resolved, I believe,
because near the beginning of the crq code there is the locution:
if(!requireNamespace("survival", quietly = TRUE))
stop("crq requires survival package to be installed")
However, when R CMD check tries to do one of the crq examples I see:
f <- crq(Surv(y,d,type = "left") ~ x, method = "Portnoy")
Error in eval(expr, envir, enclos) : could not find function "Surv"
Calls: crq ... eval -> model.frame -> model.frame.default -> eval -> eval
Execution halted
Can someone suggest a fix?
'Writing R Extensions' ยง1.1.3.1 does. Either use survival::Surv in that
call, or if your code expects only 'Surv', have
Surv <- survival::Surv
somewhere in the environment tree where your formula is evaluated.
Roger
--
Brian D. Ripley, rip...@stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
1 South Parks Road, Oxford OX1 3TG, UK
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