Take the difference between two columns
<p>I have two data: list contains 271 values and listfull contains 355 values (271 of them are the same as in list). What I want is to print out the 84 different values in these two files. When I write the codes to print the "same" values, they work but not for the "different case". I tried to figure out why but could not. Can you please help me out of this. Thanks</p>

<pre><code>list&lt;-read.table("C:\\Data\\list.txt", header=T)
listfull&lt;-read.table("C:\\Data\\listfull.txt", header=T)



for (i in 1:271)
{
  for (j in 1:355)
  {
    if(list$Cow_ID[i]==listfull$Cow_ID[j])
    bo&lt;-data.frame(listfull[j,])

   }
    write.table(bo,"C:\\Data\\store.txt",row.names = FALSE, dec = ".", na = "NA", sep = " ", append = TRUE, col.names = FALSE)
}
</code></pre>

<p>//These above codes work!</p>

<p>//But not the following:</p>

<pre><code>for (i in 1:355)
{
for (j in 1:271)
{
if(listfull$Cow_ID[i]!=listfull$Cow_ID[j])
  bo&lt;-data.frame(listfull[i,])

  }

  write.table(bo,"C:\\Data\\store.txt",row.names = FALSE, dec = ".", na = "NA", sep = " ", append = TRUE, col.names = FALSE)
}
</code></pre>

<p>Here how list and listfull look like:</p>

<pre><code>Lisfull List
Cow_ID  Cow_ID
26       26
32       32
35       35
219      219
302      302
308      308
383 
400 
441 
445 
446 
453 
462 
</code></pre>