Here's another way, using the reshape2 package:
library(reshape2)
d <- dcast(df, vial ~ measure, value_var = 'value')
d$diff <- with(d, B - A)
> d
vial A B diff
11 12 26 14
22 30 45 15
33 27 325
44 6 34 28
HTH,
Dennis
On Fri, Oct 21, 2011 at 3:31 PM, Nathan Miller
Hi,
It shouldn't be so complicated. What about simply:
> td
vial measure value
21 A12
11 B26
42 A30
32 B45
63 A27
53 B32
84 A 6
74 B34
> td <- td[order(td$vial, td$measure),] # make s
Hi all,
Say I have a data frame something like the one below with different sample
vials, measured before(B) and after(A) some process, with a value recorded
at each measurement point
vialmeasurevalue
1 B26
1 A12
2 B 45
2
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