R help - Jan 2005 - print(cat(bleh)) shows up strange NULL

I am trying the following code...

for(i in 1:bins){
  print(cat(c(i, length(var1[var1==i]))))
}

Where var1 is a vector with zero or more values = {1, 2, ..., bins} (or
something like that).

The result I get is...

1 33NULL
2 28NULL
3 39NULL
4 27NULL
5 32NULL
6 30NULL
7 23NULL
8 16NULL
9 10NULL
10 15NULL
11 13NULL
12 7NULL
13 3NULL
14 7NULL
15 2NULL
16 0NULL
17 2NULL
18 0NULL
19 0NULL
20 3NULL

I don't know what I am doing to get those stray NULL characters printed.

I also tried...

for(i in 1:bins){
  print(cat(i, length(var1[var1==i])))
}

Which is essentially the same.

Dan Bolser <dmb at mrc-dunn.cam.ac.uk> writes:
> I am trying the following code...
> 
> for(i in 1:bins){
>   print(cat(c(i, length(var1[var1==i]))))
> }
> 
> Where var1 is a vector with zero or more values = {1, 2, ..., bins} (or
> something like that).
> 
> The result I get is...
> 
> 1 33NULL
> 2 28NULL
............
> 19 0NULL
> 20 3NULL
> 
> I don't know what I am doing to get those stray NULL characters
printed.
You're printing them, will you believe it...?
 
Consider this:
> x <- cat("abc")
abc> print(x)
NULL
> x
NULL
> print(cat("abc"))
abcNULL

I.e. cat() always returns NULL, invisibly unless you force it to be
printed. 


-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907

Consider the following: 

 > for(i in 1:2)cat(i, "")
1 2 >
 > for(i in 1:2)print(i)
[1] 1
[1] 2
 > for(i in 1:2)print(cat(i))
1NULL
2NULL
   
      hope this helps.  spencer graves

Dan Bolser wrote:
>I am trying the following code...
>
>for(i in 1:bins){
>  print(cat(c(i, length(var1[var1==i]))))
>}
>
>Where var1 is a vector with zero or more values = {1, 2, ..., bins} (or
>something like that).
>
>The result I get is...
>
>1 33NULL
>2 28NULL
>3 39NULL
>4 27NULL
>5 32NULL
>6 30NULL
>7 23NULL
>8 16NULL
>9 10NULL
>10 15NULL
>11 13NULL
>12 7NULL
>13 3NULL
>14 7NULL
>15 2NULL
>16 0NULL
>17 2NULL
>18 0NULL
>19 0NULL
>20 3NULL
>
>I don't know what I am doing to get those stray NULL characters printed.
>
>I also tried...
>
>for(i in 1:bins){
>  print(cat(i, length(var1[var1==i])))
>}
>
>Which is essentially the same.
>
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