#Some cases:
ifelse(blah!="xyz",paste0(blah,1),blah)
#[1] "x11" "x21" "x31" "x41" "x51"
if(sum(blah=="xyz")>0) blah else paste0(blah,1)
#[1] "x11" "x21" "x31" "x41" "x51"
if(any(blah=="xyz")) blah else as.numeric(factor(blah))
#[1] 1 2 3 4 5
A.K.
----- Original Message -----
From: Joseph Trubisz <jtrub...@me.com>
To: arun <smartpink...@yahoo.com>
Cc:
Sent: Wednesday, May 22, 2013 2:37 PM
Subject: Re: [R] How to test if something doesn't exist
OK...got it...thanks....
Joe
On May 22, 2013, at 2:34 PM, arun <smartpink...@yahoo.com> wrote:
>
> any(blah=="xyz") #gives FALSE as mentioned in the preivous email.
>
>
>
>
> ----- Original Message -----
> From: Joseph Trubisz <jtrub...@me.com>
> To: arun <smartpink...@yahoo.com>
> Cc:
> Sent: Wednesday, May 22, 2013 2:32 PM
> Subject: Re: [R] How to test if something doesn't exist
>
> Problem is how do you test it?
> In the example, I KNOW it doesn't exist, and I don't want to do a block of
> code that follows if it does not.
>
> Example:
>
> idx<-which(blah[,1]=="xxx")
> if( idx>0) #doesn't work...what does?
> {
> ...
> }
>
>
> On May 22, 2013, at 2:29 PM, arun <smartpink...@yahoo.com> wrote:
>
>> Hi Joe,
>> Not sure about your expected result
>> blah<- paste0("x",1:5)
>> which(blah=="xyz")
>> #integer(0)
>> blah=="xyz"
>> #[1] FALSE FALSE FALSE FALSE FALSE
>> any(blah=="xyz")
>> #[1] FALSE
>>
>>
>> sum(blah=="xyz")
>> #[1] 0
>> sum(blah=="x1")
>> #[1] 1
>> A.K.
>>
>>
>>
>> ----- Original Message -----
>> From: Joseph Trubisz <jtrub...@me.com>
>> To: r-help@r-project.org
>> Cc:
>> Sent: Wednesday, May 22, 2013 2:08 PM
>> Subject: [R] How to test if something doesn't exist
>>
>> Couldn't exactly explain the subject, so here's the example:
>>
>> idx<-which(blah[,1]=="xyz")
>> idx
>> integer(0)
>>
>> How do I test that idx has a valid value (namely, > 0)?
>>
>> TiA,
>> Joe
>>
>> ______________________________________________
>> R-help@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.
>>
>
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and provide commented, minimal, self-contained, reproducible code.
