I am a bit confused as to what the following command does:
evens <- df$nums %% 2 == 0
In my matrix example, let's say I am looking for the variable(s) BC and I
want R to return all the rows with that value... or If I want a value such
as 33.543. How would I get it to do that? Just a single value in the
latter case. I have already converted it to a data frame.
Thanks a lot!
On Tue, Jul 21, 2009 at 11:34 AM, Steve Lianoglou <
mailinglist.honey...@gmail.com> wrote:
>
> On Jul 21, 2009, at 1:47 PM, Mehdi Khan wrote:
>
> Hello all,
>>
>> I have a seemingly simple question which I have searched for an answer for
>> for a few hours without luck. I have a matrix of both values and
>> characters
>> with thousands of rows. I would like to run a search of this matrix for
>> certain values and would like the search to retrieve the entire row. How
>> would I accomplish this?
>>
>
> Oh, values! Woops
>
> Like so?
>
> df <- data.frame(nums=1:10, words=c("Abelonian",
> "abeltree",
> "Abencerrages",
> "abenteric",
> "abepithymia",
> "Aberdeen",
> "aberdevine",
> "Aberdonian",
> "Aberia",
> "aberrance"))
>
> evens <- df$nums %% 2 == 0
> df[evens,]
>
> You can build such an indexing vector (like evens) in a number of different
> ways to suite your problem.
>
>
> -steve
>
> --
> Steve Lianoglou
> Graduate Student: Physiology, Biophysics and Systems Biology
> Weill Medical College of Cornell University
>
> Contact Info:
> http://cbio.mskcc.org/~lianos/contact<http://cbio.mskcc.org/%7Elianos/contact>
>
>
>
>
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