Message-ID: <AF84AD19B4A8D411B18500508BAF0E0E018B56F2@se-excur01-uslj.nadi.uslj>
Date: 2002-11-15T17:35:48Z
From: yiping.fan@syngenta.com
Subject: collapse rows in a matrix
Hi, all,
I have a little problem to solve. I'd like to collapse rows which are next
to each other but have
same value to one row. The following is an example.
say x is a data frame like:
X1 X2 X3 X4 X5
a 1 0 0 0 1
b 1 0 1 0 1
c 1 0 0 0 1
d 1 0 0 0 1
e 1 0 0 0 1
f 1 1 0 0 1
g 1 1 0 0 1
notice that a, c,d,e are the same. since c,d,e are next to each other, I
will only use the middle
one,i.e d. I will also keep a although it is the same as d.
f,g , I will keep f or g.
so the ideal output is:
a 1 0 0 0 1
b 1 0 1 0 1
d 1 0 0 0 1
f 1 1 0 0 1
Any idea how to do it? Thanks!!
Y. Fan
by the way,
unique(x) does not give me the desired output: it remove c,d,e
X1 X2 X3 X4 X5
a 1 0 0 0 1
b 1 0 1 0 1
f 1 1 0 0 1
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
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