FAQ
Hi,

I apologize for my hasty posting. The function works perfectly, after I
realized that I had a matrix named "T" sitting in my workspace, so when I
set my default option for "increase" to T, it created a problem. Changing
my default to "TRUE" solved my problem.

Thanks,
Ravi.
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-
bounces at stat.math.ethz.ch] On Behalf Of Ravi Varadhan
Sent: Monday, November 21, 2005 6:17 PM
To: 'RHelp'
Subject: [R] Can't figure out warning message

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

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.

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