[R] selecting unique columns of a matrix/data frame

[James W. MacDonald]

Stephen Nyangoma wrote:

> Hi all,
> I have a very high dimensional data and apparently there are several
> columns that contain similar information (some columns are equal). I
> want to form a matrix/data frame consisting of unique columns. Does
> anyone have an efficient way of getting out these columns. A small
> section of the data frame is given below.
> 
> Thanks for helping.
> 
> Stephen.
?unique
-- 
James W. MacDonald
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109