R help - Jul 2007 - for loop doesn't stop with upper loop value

Hi list,

could anyone please educate me on the following:

lst<-seq(47, 239, by=12)

for(n in lst)
{
  lower=n; upper=lower+10
   for(i in lower+2 : upper) 
   { 
     print(paste(n, " i: ", i, " lower: ",lower, "
upper :", upper))
   }  
}

does not stop when i = upper


A while loop fixes this but, I still don't understand why the for loop
doesn't stop when I has the value of upper


for(n in lst)
{
  lower=n; upper=lower+10
   while(lower !=upper +1)
   { 
    print(paste(n, " lower: ",lower, " upper :", upper))
     lower=lower+1
   }  
}

Any enlightment would be most welcome.

Thankx 
Herry

_______________________________________________________________________________________


lower+2 : upper parses as lower + (2:upper). The colon operator has
fairly high precedence. What you want is (lower + 2):upper


-- 
Hong Ooi
Senior Research Analyst, IAG Limited
388 George St, Sydney NSW 2000
+61 (2) 9292 1566
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of
Alexander.Herr at csiro.au
Sent: Wednesday, 4 July 2007 10:01 AM
To: r-help at stat.math.ethz.ch
Subject: [R] for loop doesn't stop with upper loop value

Hi list,

could anyone please educate me on the following:

lst<-seq(47, 239, by=12)

for(n in lst)
{
  lower=n; upper=lower+10
   for(i in lower+2 : upper) 
   { 
     print(paste(n, " i: ", i, " lower: ",lower, "
upper :", upper))
   }  
}

does not stop when i = upper


A while loop fixes this but, I still don't understand why the for loop
doesn't stop when I has the value of upper


for(n in lst)
{
  lower=n; upper=lower+10
   while(lower !=upper +1)
   { 
    print(paste(n, " lower: ",lower, " upper :", upper))
     lower=lower+1
   }  
}

Any enlightment would be most welcome.

Thankx 
Herry

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_______________________________________________________________________________________

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On 4/07/2007, at 12:01 PM, <Alexander.Herr at csiro.au>  
<Alexander.Herr at csiro.au> wrote:
> Hi list,
>
> could anyone please educate me on the following:
>
> lst<-seq(47, 239, by=12)
>
> for(n in lst)
> {
>   lower=n; upper=lower+10
>    for(i in lower+2 : upper)
>    {
>      print(paste(n, " i: ", i, " lower: ",lower, "
upper :", upper))
>    }
> }
>
> does not stop when i = upper

	To see what's going on, type

		239+2:249

	Hints:

			o precedence of operators (this ain't APL)
			o parentheses are Good Things.

				cheers,

					Rolf Turner

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