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

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of ingaschwabe
Sent: Thursday 18 October 2012 4:51
To: r-help at r-project.org
Subject: Re: [R] For loop with i and j and multiple if statements...
help!

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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