R help - Mar 2012 - if statement

Hi All,

I have one difficulty in using the conditional if statement

Assume ,

x <- -1:4
 x
[1] -1  0  1  2  3  4

if x is lees than want I want to add 1 and I used the following command
 if(x<0) {x=x+1}

Warning message:
In if (x < 0) { :
  the condition has length > 1 and only the first element will be
used
> x
[1] 0 1 2 3 4 5
 That command added 1 to each element.

But I want like this  0 0 1 2 3 4

Can anybody help me?

Thanks
Val

	[[alternative HTML version deleted]]

You need ifelse() instead of if().

On Wed, Mar 7, 2012 at 2:12 PM, Val <valkremk at gmail.com>
wrote:
> Hi All,
>
> I have one difficulty in using the conditional if statement
>
> Assume ,
>
> x <- -1:4
> ?x
> [1] -1 ?0 ?1 ?2 ?3 ?4
>
> if x is lees than want I want to add 1 and I used the following command
> ?if(x<0) {x=x+1}
>
> Warning message:
> In if (x < 0) { :
> ?the condition has length > 1 and only the first element will be used
>> x
> [1] 0 1 2 3 4 5
> ?That command added 1 to each element.
>
> But I want like this ?0 0 1 2 3 4
>
> Can anybody help me?
>
> Thanks
> Val
-- 
Sarah Goslee
http://www.functionaldiversity.org

Try
> ifelse( x < 0, x + 1, x)
[1] 0 0 1 2 3 4

See also ?ifelse.

HTH,
Jorge.-


On Wed, Mar 7, 2012 at 2:12 PM, Val <> wrote:
> Hi All,
>
> I have one difficulty in using the conditional if statement
>
> Assume ,
>
> x <- -1:4
>  x
> [1] -1  0  1  2  3  4
>
> if x is lees than want I want to add 1 and I used the following command
>  if(x<0) {x=x+1}
>
> Warning message:
> In if (x < 0) { :
>  the condition has length > 1 and only the first element will be used
> > x
> [1] 0 1 2 3 4 5
>  That command added 1 to each element.
>
> But I want like this  0 0 1 2 3 4
>
> Can anybody help me?
>
> Thanks
> Val
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> 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.
>
	[[alternative HTML version deleted]]

> x <- -1:4
> x<0 # returns TRUE (1) or FALSE (0)
[1]  TRUE FALSE FALSE FALSE FALSE FALSE
> x+as.numeric(x<0)
[1] 0 0 1 2 3 4