[R] another basic ?

[Peter Dalgaard BSA]

jimi adams <adams.644 at osu.edu> writes:

> i am sure that there is a simple solution that i am just overlooking,
> but there is no logical test for =
> there is one for != and >,<, >=, <=...
> what do i do if i need to check if something IS EQUAL

Double it: ==

> or is there an easy way, in working with a matrix of size n x 3,  to
> sort the matrix by one of the columns?
> 
> specifically what i am trying to do is i have a matrix with individual
> and group labels that is randomly generated, and is by default sorted
> by the individual labels ( column 1) and i want them to be organized
> into unique group labels (comlumn 2)
> thanks

m[order(m[,2]),]

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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