[R] Creating subsets of a matrix

[jim holtman]

Try 'split'

> x
    bmi gender
1 24.78   male
2 26.42   male
3 23.18 female
4 22.36 female
> # create a list with the split genders
> split(x, x$gender)
$female
    bmi gender
3 23.18 female
4 22.36 female

$male
    bmi gender
1 24.78   male
2 26.42   male

>
>


On Sun, Jan 23, 2011 at 1:36 PM, poolmunch <poolmunch at gmail.com> wrote:
>
> Hello,
>
> Say I have 2 columns, bmi and gender, the first being all the values and the
> second being male or female. How would I subset this into males only and
> females only? I have searched these fora and read endlessly about select[]
> and split() functions but to no avail. Also the table is not ordered.
>
>     bmi gender        ->      bmi gender         +    bmi  gender
> 1  24.78   male              1 24.78   male           3 23.18  female
> 2  26.42   male              2 26.42   male           4 22.36  female
> 3  23.18 female              ...                          ...
> 4  22.36 female
> ...
>
> Thank you in advance
> --
> View this message in context: http://r.789695.n4.nabble.com/Creating-subsets-of-a-matrix-tp3232838p3232838.html
> Sent from the R help mailing list archive at Nabble.com.
>
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>



-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?