How can I make the output from tapply() into a data.frame
- by James Thompson
I have a data.frame in R that looks like this:
score rms template aln_id description
1 -261.410 4.951 2f22A.pdb 2F22A_1 S_00001_0000002_0
2 -231.987 21.813 1wb9A.pdb 1WB9A_4 S_00002_0000002_0
3 -263.722 4.903 2f22A.pdb 2F22A_3 S_00003_0000002_0
4 -269.681 17.732 1wbbA.pdb 1WBBA_6 S_00004_0000002_0
5 -258.621 19.098 1rxqA.pdb 1RXQA_3 S_00005_0000002_0
6 -246.805 6.889 1rxqA.pdb 1RXQA_15 S_00006_0000002_0
7 -281.300 16.262 1wbdA.pdb 1WBDA_11 S_00007_0000002_0
8 -271.666 4.193 2f22A.pdb 2F22A_2 S_00008_0000002_0
9 -277.964 13.066 1wb9A.pdb 1WB9A_5 S_00009_0000002_0
10 -261.024 17.153 1yy9A.pdb 1YY9A_2 S_00001_0000003_0
I can calculate summary statistics on the data.frame like this:
> tapply( d$score, d$template, mean )
1rxqA.pdb 1wb9A.pdb 1wbbA.pdb 1wbdA.pdb 1yy9A.pdb 2f22A.pdb
-252.7130 -254.9755 -269.6810 -281.3000 -261.0240 -265.5993
Is there an easy way that I coerce this output back into a data.frame? I'd like for it to have these two columns:
d$template
mean
I love tapply, but right now I'm cutting and pasting the results from tapply into a text file and hacking it up a bit to get the summary statistics that I want with appropriate names. This feels very wrong, and I'd like to do something better!
