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2012 May 09
1
How to apply functions across columns?
Hello,
me again.
I have a data frame that looks like this (actual dput output at bottom):
> head(tencor)
date lot wf.id s1 s2 s3 s4 s5
1 08.05.2012 W0X3H0 9 1238 1263 1244 1200 1183
2 08.05.2012 W0X3H0 10 1367 1396 1371 1325 1311
3 08.05.2012 W0X3H0 11 1383 1417 1393 1346 1328
I'd like to add a column to this that gives, for each row, the
averages of the values in the columns s1 to s5. Really primitive. But
I totally absolute don't...