[R] For loop with i and j and multiple if statements... help!

[ingaschwabe]

Dear all, 

Thanks for the many replies!

Indeed, the function does not represent my explanation. It should have been: 

if (x[i] > 170 && x[i] < 1250 && y[j] > 150 && y[j] < 480) 

Sorry, my mistake. 

My data looks like this: 
head(input[,3:4])
    x   y
1 701 209
2 685 209
3 566 248
4 562 234
5 601 225
6 608 232


Refering to the last post, I guess that my function then should look like
something like this: 

test <- apply(input,1,function(x){ 
              lookzone<-NULL 
              if (x[1] > 170 && x[1] < 1250 && y[1] > 150 && y[1] < 480)
              {lookzone<-1} 
              if (x[1] > 170 && x[1] < 420  && y[1] > 480 && y[1] < 810)
              {lookzone <- 2} 
              return(lookzone)
              })

however, when I run the function then nothing happens. 

and when I ask explicitly for the result then I get this 
> test
NULL

Can someone tell me what goes wrong here? Or give a hint? 
I'm not used to using the apply function and do use the for loop on the
basis of an example that I once made so I am not a very experienced R user.. 

Thank you so much for your help!
I really appreciate it!

Bye,inga



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