transform - R stats, transforming parts of a data matrix -

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i new both stackoverflow , r stats, please bear me. have lot of experience coding in sas, trying learn r. commonly use sas , r transform large datasets, have species study site matrix follows:

 species status role site1 site2 site3...site25 a_a      s      p     0     0     0       1 a_b          x     1     25    0       0 b_a      s      p     0      2    1       1 b_b      s      x     0      1    0       0 ...

i transform table , create 2 new variables called "site" , "count" based on site variable names , count data within each site:

 species status role site count a_a      s      p   site1  0 a_a      s      p   site2  0 a_a      s      p   site3  0 a_a      s      p   site25 1 a_b          x   site1  1 a_b          x   site2  25 a_b          x   site3  0 a_b          x   site25 0 ... b_b      s      x   site25 0

i think may beyond simple t() function, , have looked packages reshape , reshape2, kind of lost how proceed. have had situation , lend hand coding? thanks, jimh

you can use dplyr/tidyr this:

install.packages(c("tidyr", "dplyr"), dependencies = true) library(dplyr) library(tidyr) df %>% gather(site, count, grep('site', names(df))) %>% arrange(species)

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