| To: | s-plus user list <s-news@lists.biostat.wustl.edu> |
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| Subject: | transforming 2D matrix to 4D array |
| From: | Xao Ping <xao_ping@yahoo.com> |
| Date: | Wed, 16 Feb 2005 17:40:24 -0800 (PST) |
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Dear All:
I would appreciate an advice on the following matter. I have a data set organized as a matrix with 20000 rows and 72 columns. The column names represent a chierarchical structure. Namely, there is 6 logically different groups, each containing 12 columns. There are 4 sub-groups within each of these 6 groups, each containing 3 columns. I would like to transform the 2D data matrix into 4D array with dim=c(20000,6,4,3). Is there any smart way to perform this task without resorting to "for" loops?
Thank you in advance
Xao Ping
R&R Pharmakinetics
Taiwan
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