R help - Jul 2005 - Error message NA/NaN/Inf in foreign function call (arg 6) when using knn()

I am trying to use knn to do a nearest neighbor classification.  I tried using
my dataset and got an error message so I used a simple example to try and
understand what I was doing wrong and got the same message.  Here is what I
typed into R:
 try
  [,1] [,2] [,3] [,4]
r "A"  "A"  "T"  "G" 
r "A"  "A"  "T"  "G" 
f "A"  "A"  "c"  "G" 
f "A"  "A"  "c"  "G" 
f "A"  "A"  "c"  "G"
> cl2 <-factor(c(rep("1",2), rep("2",3)))
> cl2
[1] 1 1 2 2 2
Levels: 1 2
> knn(try, try, cl2, k = 2)
Error in knn(try, try, cl2, k = 2) : NA/NaN/Inf in foreign function call (arg 6)
In addition: Warning messages: 
1: NAs introduced by coercion 
2: NAs introduced by coercion 

I used try as test and train because I thought the error might be that the size
of test and train data were different.  If someone could explain what the error
means or how to fix it, I would greatly appreciate it.
Kerri-Ann Norton

Kerri-Ann Norton wrote:
> I am trying to use knn to do a nearest neighbor classification.  I tried
using my dataset and got an error message so I used a simple example to try and
understand what I was doing wrong and got the same message.  Here is what I
typed into R:
>  try
>   [,1] [,2] [,3] [,4]
> r "A"  "A"  "T"  "G" 
> r "A"  "A"  "T"  "G" 
> f "A"  "A"  "c"  "G" 
> f "A"  "A"  "c"  "G" 
> f "A"  "A"  "c"  "G" 
> 
>>cl2 <-factor(c(rep("1",2), rep("2",3)))
>>cl2
> 
> [1] 1 1 2 2 2
> Levels: 1 2
> 
>>knn(try, try, cl2, k = 2)
> 
> Error in knn(try, try, cl2, k = 2) : NA/NaN/Inf in foreign function call
(arg 6)
> In addition: Warning messages: 
> 1: NAs introduced by coercion 
> 2: NAs introduced by coercion 
> 
> I used try as test and train because I thought the error might be that the
size of test and train data were different.  If someone could explain what the
error means or how to fix it, I would greatly appreciate it.
> Kerri-Ann Norton
> 
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What is the euclidean distance between "c" and "T"?

I think this is a user error which the code does not intercept with a 
nice error message.

Uwe Ligges