R help - Aug 2011 - Asking Favor For "Remove element with Particular Value In Vector"

Dear All.

I am Chuan. I am beginner for R.I facing some problem in remove element from
vector.I have a vector with size 238 element as follow(a part)

[1] 0 18 24 33 44..................................[238] 255

Let the vector label as "x",I want remove element "0" and
"255".I try use
such function:

x[x>0 & x<255]

However, I am fail since same results are give even try it for many times.I
also try with shorter vector with 10 element. It is successfully resulted.
So,want can I do for it. Kindly asking favor for expert here. Thank you very
much.

Chuan

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Not sure whether I understand your question right but here is what I would do:

# Sample data
x <- seq(  1, 100, by=6)
x
 [1]  1  7 13 19 25 31 37 43 49 55 61 67 73 79 85 91 97

# remove element with value 19
x <- x[ x != 19 ]
x
 [1]  1  7 13 25 31 37 43 49 55 61 67 73 79 85 91 97

If you want to remove values smaller / larger than a certain threshold, your 
way should work well:

# Sample data
x <- seq(  1, 100, by=6)
x[9] <- 155
x
 [1]   1   7  13  19  25  31  37  43 155  55  61  67  73  79  85  91  97

# Remove elements smaller than 20 or larger than 80:
 x <- x[ x > 20 & x < 80 ]
x
 [1] 25 31 37 43 55 61 67 73 79

So there is probably an issue with your data vector - why don't you dput()
it?

Rgds,
Rainer


On Saturday 27 August 2011 02:31:29 chuan_zl wrote:
> Dear All.
> 
> I am Chuan. I am beginner for R.I facing some problem in remove element
from
> vector.I have a vector with size 238 element as follow(a part)
> 
> [1] 0 18 24 33 44..................................[238] 255
> 
> Let the vector label as "x",I want remove element "0"
and "255".I try use
> such function:
> 
> x[x>0 & x<255]
> 
> However, I am fail since same results are give even try it for many times.I
> also try with shorter vector with 10 element. It is successfully resulted.
> So,want can I do for it. Kindly asking favor for expert here. Thank you
very
> much.
> 
> Chuan
> 
> --
> View this message in context:
> http://r.789695.n4.nabble.com/Asking-Favor-For-Remove-element-with-Particul
> ar-Value-In-Vector-tp3772779p3772779.html Sent from the R help mailing list
> archive at Nabble.com.
> 
> ______________________________________________
> 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.

On Aug 27, 2011, at 5:31 AM, chuan_zl wrote:
> Dear All.
>
> I am Chuan. I am beginner for R.I facing some problem in remove  
> element from
> vector.I have a vector with size 238 element as follow(a part)
>
> [1] 0 18 24 33 44..................................[238] 255
>
> Let the vector label as "x",I want remove element "0"
and "255".I
> try use
> such function:
>
> x[x>0 & x<255]
I am not completely clear but it appears that you want to remove the  
first and last elements. You can use negative indexing vectors.

x[ -c(1, length(x) ) ]

>
> However, I am fail
Perhaps your vector is a factor? Try this and see what you get:

str(x)

> since same results are give even try it for many times.I
> also try with shorter vector with 10 element. It is successfully  
> resulted.
> So,want can I do for it. Kindly asking favor for expert here. Thank  
> you very
> much.
>
> Chuan
>
> --

David Winsemius, MD
West Hartford, CT

You can use 'which' and negative subscripts to remove elements from a
vector.

 y<-x[-(which(x==0|x==255))] 



chuan_zl wrote:
> 
> Dear All.
> 
> I am Chuan. I am beginner for R.I facing some problem in remove element
> from vector.I have a vector with size 238 element as follow(a part)
> 
> [1] 0 18 24 33 44..................................[238] 255
> 
> Let the vector label as "x",I want remove element "0"
and "255".I try use
> such function:
> 
> x[x>0 & x<255]
> 
> However, I am fail since same results are give even try it for many
> times.I also try with shorter vector with 10 element. It is successfully
> resulted. So,want can I do for it. Kindly asking favor for expert here.
> Thank you very much.
> 
> Chuan
> 

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chuan_zl wrote:

 > Dear All.
 >
 > I am Chuan. I am beginner for R.I facing some problem in remove 
element from
 > vector.I have a vector with size 238 element as follow(a part)
 >
 > [1] 0 18 24 33 44..................................[238] 255
 >
 > Let the vector label as "x",I want remove element "0"
and "255".I try use
 > such function:
 >
 > x[x>0 & x<255]

Hi Chuan,
If you want to remove the specific values 0 and 255 from your vector, try:

x<-x[-which(x %in% c(0,255))]

Jim

Thank you very much,friend.

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Thank you very much,friend.

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Thank you friend for suggestion.

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