[R] an entry level (stupid) question

[Chris Campbell]

Hi Yanyuan

Check out:
   
?"=="
?"["
?"<-"
   
You should be able to assign the column quickly with no more than two lines of code using square brackets and assign.   
   
Or to literally use if, look at:   
   
?"ifelse"
   

Happy Christmas
   
Chris
   

Chris Campbell   
Tel. +44 (0) 1249 705 450 | Mobile. +44 (0) 7929 628349   
mailto:ccampbell at mango-solutions.com | http://www.mango-solutions.com   
Mango Solutions  
2 Methuen Park 
Chippenham 
Wiltshire  
SN14 OGB 
UK 

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Yanyuan Zhu
Sent: 20 December 2012 15:48
To: r-help at r-project.org
Subject: [R] an entry level (stupid) question

Hello all, i'm a newbie to R and now I get stuck by the question, would anybody help me please?

Suppose, I got the following

> test <- data.frame(test1=c(c(0.00, 0.005, 0.01, 0.015, 0.02))) test
  test1
1 0.000
2 0.005
3 0.010
4 0.015
5 0.020

Now I want another column inside test, named test2 for i=c(1:5), If test$test1[i] is 0, then the value of test$test2[i] is 1/test1[i] or else If test$test1[i] is not 0, then the value of test$test2[i] is 39

how should i programme in R to make it happen?

thanks a lot!

	[[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

--

LEGAL NOTICE\ \ This message is intended for the use of ...{{dropped:18}}