[R] loops in R

[Berend Hasselman]

On 05-11-2014, at 14:41, Noha Osman <nmo_138 at usc.edu> wrote:

> Hi Folks
> 
> Iam  a new user of R and I have a question . Hopefully anyone help me in that issue
> 
> 
> I have that dataset as following
> 
> Sample      Population  Species  Tissue         R         G        B
> 1 Bari1_062-1      Bari1     ret   seed  94.52303  80.70346 67.91760
> 2 Bari1_062-2      Bari1     ret   seed  98.27683  82.68690 68.55485
> 3 Bari1_062-3      Bari1     ret   seed 100.53170  86.56411 73.27528
> 4 Bari1_062-4      Bari1     ret   seed  96.65940  84.09197 72.05974
> 5 Bari1_062-5      Bari1     ret   seed 117.62474  98.49354 84.65656
> 6 Bari1_063-1      Bari1     ret   seed 144.39547 113.76170 99.95633
> 
> and I have 20 populations as following
> 
> [1] Bari1      Bari2      Bari3      Besev      Cermik     Cudi       Derici     Destek     Egil
> [10] Gunasan    Kalkan     Karabace   Kayatepe   Kesentas   Ortanca    Oyali      Cultivated Sarikaya
> [19] Savur      Sirnak
> 
> I need to calculate mean and variance of each population using column [R] using  for-loop

If I’m correct you asked an almost identical question Stackoverflow (http://stackoverflow.com/questions/26742023/how-can-i-use-loops-in-r).

You got all the answers you need.

Berend