Ravi Varadhan <[EMAIL PROTECTED]> writes:
> Hi,
>
> I have written the following function to check whether a vector has elements
> satisfying monotonicity.
>
> is.monotone <- function(vec, increase=T){
> # check for monotonicity in time-stamp data for cortisol collection
> ans <- TRUE
> vec.nomis <- vec[!is.na(vec)]
> if (increase & any(diff(vec.nomis,1) < 0, na.rm=T)) ans <- FALSE
> if (!increase & any(diff(vec.nomis,1) > 0, na.rm=T)) ans <- FALSE
> ans
> }
>
> This works correctly, but I get this error message as below.
>
> > x <- 2:10
> > is.monotone(x)
> [1] TRUE
> Warning messages:
> 1: the condition has length > 1 and only the first element will be used in:
> if (increase & any(diff(vec.nomis, 1) < 0, na.rm = T)) ans <- FALSE
> 2: the condition has length > 1 and only the first element will be used in:
> if (!increase & any(diff(vec.nomis, 1) > 0, na.rm = T)) ans <- FALSE
> >
>
> I am unable to see why the condition should have a length greater than 1,
> since "any" should give me a single logical value.
>
> Can any one tell me what is going on here? ( I am using version 2.1.1 on
> Windows).
Would you happen to have a variable called "T" around?
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