Sender: r-help-boun...@r-project.org
On-Behalf-Of: mailinglist.honey...@gmail.com
Subject: Re: [R] vector help
Message-Id: <2154bd29-add9-4cfc-8447-ba5eea3a3...@gmail.com>
Recipient: yingmei.la...@magnetar.com
--- Begin Message ---
Hi Ramya,
On Dec 10, 2009, at 3:29 PM, David Winsemius wrote:
>
> On Dec 10, 2009, at 2:55 PM, Ramya wrote:
>
>>
>> I have tow vectors one is the subset of another
>>
>> x is a subset of X Both are vectors with n elements
>>
>> X[X %in% x] would give me x again rite because it is a subset but i want all
>> those are not in x from X.
>>
>> X[which(X != x)] should this do that
One way to increase your proficiency in R is to break out your statements so
that each line does 1 thing.
You should look at the object that `X != x` returns to you. [Shuffle the
elements in X and x and then see how that changes for extra credit]
Then look at what `which(X != x)` gives you.
Doing that, you'd see why what you tried originally didn't work.
>
> Perhaps you think R _should_ read your mind, but we are not there yet. Try
> instead:
>
> X[!(X %in% x)]
There are also set-like functions in R, which might fit your brain-way of
thinking:
Get elements that are in both x and X:
intersect(X,x)
Get elements in X that are not in x
setdiff(X,x)
--
Steve Lianoglou
Graduate Student: Computational Systems Biology
| Memorial Sloan-Kettering Cancer Center
| Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos/contact
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