Dear all -
I imported (on a Mac) a big table with >2000 lines:
> mydata <- read.table(file("/Users/didiw/Desktop/R/all.txt"), header = TRUE)
> mydata[1:15,]
location Spezies Spec E.MPa. Phi No Trial
1 LC P J 13.27 7.51 1 1
2 LC P J 14.24 6.68 1 1
3 LC P J 14.28 7.01 2 1
4 LC P J 16.65 6.30 1 2
....
Now i want to crate a new table "mymeans" where all means and Stdev
of E.MPa and Phi when location, Spezies, No, and Trial are the same,
something like this:
location Spezies Spec No Trial mean.E stddev.E mean.Phi
std.Phi
1 LC P J 1 1 xx xx xx
xx
2 LC P J 2 1 xx xx xx
xx
3 LC P J 1 2 xx xx xx
xx
....
Because I we did ca 8 repetition of each measurement, the new table should
have only 2000/8 lines.
Thanks for any help!
-didi
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