[R] Can't figure out warning message

[Kjetil Brinchmann Halvorsen]

Ravi Varadhan wrote:
> Hi,
> 
>  
> 
> I apologize for the previous posting, where the message was not formatted
> properly.  Here is a better version:
> 
>  
> 
> I have written the following function to check whether a vector has elements
> satisfying monotonicity.
> 
>  
> 
> is.monotone <- function(vec, increase=T){
> 
> 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 
> 
> 

Try to double the &: && in place of &

Kjetil


>  
> 
> 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).
> 
>  
> 
> Thanks very much,
> 
> Ravi.
> 
>  
> 
> --------------------------------------------------------------------------
> 
> Ravi Varadhan, Ph.D.
> 
> Assistant Professor,  The Center on Aging and Health
> 
> Division of Geriatric Medicine and Gerontology
> 
> Johns Hopkins University
> 
> Ph: (410) 502-2619
> 
> Fax: (410) 614-9625
> 
> Email:   <mailto:rvaradhan at jhmi.edu> rvaradhan at jhmi.edu
> 
> --------------------------------------------------------------------------
> 
>  
> 
> 
> 	[[alternative HTML version deleted]]
> 
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