| To: | s-news@lists.biostat.wustl.edu |
|---|---|
| Subject: | extending matrices |
| From: | Karl "Hülber" <huelber@yahoo.com> |
| Date: | Tue, 31 Jan 2006 07:26:40 -0800 (PST) |
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Can anybody tell me a nifty way to expand a matrix or data.frame in the following way: Given are two matrices with partially corresponding column names: e.g. MAT1 has columns ?a?, ?b? and ?d?; MAT2 has columns ?a?, ?c?, ?d? and ?f?. I want to add all columns only occurring in MAT2 to MAT1 and vice-versa (missing values filled with 0). Consequently resulting matrices share the same columns - in the same alphabetic order. Any help would be greatly appreciated! Karl __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com |
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