[R] how to change a dataframe with characters to a numeric matrix?

From: zhihua li <lzhtom_at_hotmail.com>
Date: Thu 08 Dec 2005 - 20:29:47 EST


hi netters,

i have a dataframe TEST like this:

   Y1 Y2 Y3
X1 4 7 8
X2 6 2 Z
X3 8 0 1

i would like to change it to a numeric matrix, replacing "Z" with NA

   Y1 Y2 Y3
X1 4 7 8
X2 6 2 NA
X3 8 0 1

i've tried the function data.matrix but it didn't work. is there any easy way to do this?

thanks a lot!



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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Thu Dec 08 20:40:26 2005

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