From: Mike Jones <MikeJones_at_westat.com>

Date: Thu, 27 Dec 2007 17:20:23 -0500

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. Received on Thu 27 Dec 2007 - 22:23:40 GMT

Date: Thu, 27 Dec 2007 17:20:23 -0500

My apologies for not including a working example.

cat("initial i = ",i,"\n")

x <- runif(1)

if (x > 0.7){

i <- i-1

}

cat("second i = ",i,"\n")

}

When I ran this i got what follows, so there were four cases where I wanted the i not to increment.

initial i = 1

second i = 1

initial i = 2

second i = 1

initial i = 3

second i = 3

initial i = 4

second i = 3

initial i = 5

second i = 4

initial i = 6

second i = 6

initial i = 7

second i = 7

initial i = 8

second i = 7

initial i = 9

second i = 9

initial i = 10

second i = 10

*> -----Original Message-----
**> From: Mike Jones
**> Sent: Thursday, December 27, 2007 4:35 PM
*

> To: 'r-help@lists.R-project.org'

*> Subject: Conditionally incrementing a loop counter
**>
**> Hi,
**> I am trying a for loop from 1 to 10 by 1. However, if a condition does
**> not get met, I want to "throw away" that iteration. So if my loop is
**> for (i in 1:10)
**> and i is say, 4 and the condition is not met then I don't want i to go
**> up to 5. Is there a way to do that? I can't seem to manually adjust i
**> because from what I understand, R creates 10 long vector and uses that
**> to "loops thru" and I'm not sure how to get at the index of that
**> vector. Any suggestions? Thanks in advance.
**>
**>
**>
**>
**>
**>
**>
**>
**>
**>
**> Mike Jones
**> Westat
**> 1650 Research Blvd. RE401
**> Rockville, MD 20850
**> Ph: 240.314.2312
**>
*

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