[R] change values in data frames
poul
morteterre at infonie.fr
Fri Jun 27 11:17:42 CEST 2008
Hello every body,
I am quite a new user of R so I beg your pardon for this naive question and
the lake of syntax with wich I ask it:
I have a data frames like this:
cola colb
1 c
1 i
1 i
1 c
2 i
2 c
2 c
2 i
2 i
...
10000
I would like ,for each level of cola and for x in colb:
-if colb[x]=="i" and colb[x-1] does not exist (first row in dataframes),
then replace colb[x] by "l"
-if colb[x]=="i" and colb[x-1]=="c" (previous row in data frmes), then
replace colb[x] by "l"
-if colb[x]=="i" and colb[x-1]=="i" (previous row in data frmes), then
replace colb[x] by "h"
Thanks in advance
Paul
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