[R] compute differences
alessandro carletti
alxmilton at yahoo.it
Mon Sep 21 14:39:47 CEST 2009
Hi,
I have a problem.
I have a data frame looking like:
ID val
A .3
B 1.2
C 3.4
D 2.2
E 2.0
I need to CREATE the following TABLE:
CASE DIFF
A-A 0
A-B -0.9
A-C -3.1
A-D -1.9
A-E -1.7
B-A ...
B-B ...
B-C
B-D
B-E
C-A
C-B
C-C
C-D
C-E
D-A
D-B
D-C
D-D
D-E
E-A
E-B
E-C
E-D
E-E
WHERE CASE IS THE COUPLE OF ELEMENTS CONSIDEREDM AND DIFF IS THE computed DIFFERENCE between their values.
Could you give me suggestions?
Alessandro Carletti
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